Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Sep. 30, 2017	Nov. 20, 2017	Mar. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	MITK
Entity Registrant Name	MITEK SYSTEMS INC
Entity Central Index Key	0000807863
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		34,774,537
Entity Public Float			$ 215,219,795

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 12,289	$ 9,010
Short-term investments	30,279	24,863
Accounts receivable, net	7,099	4,949
Other current assets	1,209	1,485
Total current assets	50,876	40,307
Long-term investments	3,780	1,952
Property and equipment, net	613	440
Intangible assets, net	2,297	2,783
Goodwill	3,014	2,863
Deferred income taxes, net	11,065	0
Other non-current assets	74	40
Total assets	71,719	48,385
Current liabilities:
Accounts payable	1,918	1,318
Accrued payroll and related taxes	3,709	3,263
Deferred revenue, current portion	3,305	3,391
Other current liabilities	602	355
Total current liabilities	9,534	8,327
Deferred revenue, non-current portion	85	259
Other non-current liabilities	692	314
Total liabilities	10,311	8,900
Stockholders’ equity
Preferred stock, $0.001 par value, 1,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.001 par value, 60,000,000 shares authorized, 33,724,392 and 32,781,704 issued and outstanding, as of September 30, 2017 and September 30, 2016, respectively	34	33
Additional paid-in capital	78,677	71,036
Accumulated other comprehensive income (loss)	147	(42)
Accumulated deficit	(17,450)	(31,542)
Total stockholders’ equity	61,408	39,485
Total liabilities and stockholders’ equity	$ 71,719	$ 48,385

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2017	Sep. 30, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	33,724,392	32,781,704
Common stock, shares outstanding	33,724,392	32,781,704

CONSOLIDATED STATEMENTS OF OPERATIONS AND OTHER COMPREHENSIVE INCOME - USD ($) shares in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Revenue
Software	$ 29,647,000	$ 22,586,000	$ 17,870,000
SaaS, maintenance, and consulting	15,743,000	12,115,000	7,497,000
Total revenue	45,390,000	34,701,000	25,367,000
Operating costs and expenses
Cost of revenue-software	1,112,000	953,000	992,000
Cost of revenue-SaaS, maintenance, and consulting	2,929,000	2,442,000	1,479,000
Selling and marketing	14,484,000	10,937,000	6,458,000
Research and development	10,430,000	7,794,000	5,577,000
General and administrative	11,310,000	8,575,000	7,601,000
Acquisition-related costs and expenses	2,356,000	2,176,000	1,368,000
Total operating costs and expenses	42,621,000	32,877,000	23,475,000
Operating income	2,769,000	1,824,000	1,892,000
Other income, net	402,000	134,000	91,000
Income before income taxes	3,171,000	1,958,000	1,983,000
Income tax benefit	10,921,000	1,000	543,000
Net income	$ 14,092,000	$ 1,959,000	$ 2,526,000
Net income per share—basic (in dollars per share)	$ 0.43	$ 0.06	$ 0.08
Net income per share—diluted (in dollars per share)	$ 0.40	$ 0.06	$ 0.08
Shares used in calculating net income per share—basic	33,083	31,587	30,790
Shares used in calculating net income per share—diluted	35,537	33,819	31,480
Other comprehensive income:
Net income	$ 14,092,000	$ 1,959,000	$ 2,526,000
Foreign currency translation adjustment	208,000	(46,000)	0
Unrealized gain (loss) on investments	(19,000)	7,000	5,000
Other comprehensive income	$ 14,281,000	$ 1,920,000	$ 2,531,000

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Sep. 30, 2014	$ 23,942,000	$ 31,000	$ 59,946,000	$ (36,027,000)	$ (8,000)
Beginning Balance (in shares) at Sep. 30, 2014		30,521,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	$ 246,000		246,000
Exercise of stock options (in shares)	232,203	232,000
Settlement of restricted stock units	$ 0
Settlement of restricted stock units (in shares)		255,000
Acquisition-related closing shares	347,000	$ 1,000	346,000
Acquisition-related closing shares (in shares)		713,000
Stock-based compensation expense	3,367,000		3,367,000
Components of other comprehensive income:
Net income	2,526,000			2,526,000
Currency translation adjustment	0
Change in unrealized gain (loss) on investments	5,000				5,000
Other comprehensive income	2,531,000
Ending Balance at Sep. 30, 2015	30,433,000	$ 32,000	63,905,000	(33,501,000)	(3,000)
Ending Balance (in shares) at Sep. 30, 2015		31,721,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	$ 1,755,000	$ 1,000	1,754,000
Exercise of stock options (in shares)	661,663	662,000
Settlement of restricted stock units	$ 0
Settlement of restricted stock units (in shares)		262,000
Acquisition-related closing shares	0
Acquisition-related closing shares (in shares)		137,000
Stock-based compensation expense	4,079,000		4,079,000
Amortization of closing shares and earnout shares	1,298,000		1,298,000
Components of other comprehensive income:
Net income	1,959,000			1,959,000
Currency translation adjustment	(46,000)				(46,000)
Change in unrealized gain (loss) on investments	7,000				7,000
Other comprehensive income	1,920,000
Ending Balance at Sep. 30, 2016	$ 39,485,000	$ 33,000	71,036,000	(31,542,000)	(42,000)
Ending Balance (in shares) at Sep. 30, 2016	32,781,704	32,782,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	$ 687,000		687,000
Exercise of stock options (in shares)	235,514	235,000
Settlement of restricted stock units	$ 0	$ 1,000	(1,000)
Settlement of restricted stock units (in shares)		707,000
Stock-based compensation expense	5,478,000		5,478,000
Amortization of closing shares and earnout shares	1,477,000		1,477,000
Components of other comprehensive income:
Net income	14,092,000			14,092,000
Currency translation adjustment	208,000				208,000
Change in unrealized gain (loss) on investments	(19,000)				(19,000)
Other comprehensive income	14,281,000
Ending Balance at Sep. 30, 2017	$ 61,408,000	$ 34,000	$ 78,677,000	$ (17,450,000)	$ 147,000
Ending Balance (in shares) at Sep. 30, 2017	33,724,392	33,724,000

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES
Net income	$ 14,092	$ 1,959	$ 2,526
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	5,478	4,079	3,367
Amortization of closing and earnout shares	1,579	1,503	393
Amortization of intangible assets	591	598	172
Depreciation	322	790	433
Amortization of investment premiums and other	30	149	435
Deferred taxes	(11,065)	(127)	(647)
Changes in assets and liabilities:
Accounts receivable	(2,101)	(1,002)	(566)
Other assets	249	(586)	(533)
Accounts payable	593	(222)	(449)
Accrued payroll and related taxes	429	1,197	480
Deferred revenue	(269)	(67)	478
Other liabilities	517	(417)	16
Net cash provided by operating activities	10,445	7,854	6,105
INVESTING ACTIVITIES
Purchases of investments	(39,939)	(33,658)	(27,254)
Sales and maturities of investments	32,650	30,623	21,406
Acquisition, net of cash acquired	0	0	(5,423)
Purchases of property and equipment	(488)	(250)	(73)
Net cash used in investing activities	(7,777)	(3,285)	(11,344)
FINANCING ACTIVITIES
Proceeds from exercise of stock options	687	1,755	246
Principal payments on capital lease obligations	0	(22)	(20)
Net cash provided by financing activities	687	1,733	226
Foreign currency effect on cash and cash equivalents	(76)	(45)	(1)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	3,279	6,257	(5,014)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	9,010	2,753	7,767
CASH AND CASH EQUIVALENTS AT END OF PERIOD	12,289	9,010	2,753
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	0	1	4
Cash paid for income taxes	113	17	105
NON-CASH FINANCING AND INVESTING ACTIVITIES
Settlement of note receivable as consideration for business acquisition	0	0	250
Unrealized holding gain (loss) on available for sale investments	$ (19)	$ 7	$ 5

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations

Mitek Systems, Inc. ("Mitek" or the "Company") is a leading innovator of mobile identity verification solutions. Mitek is a software development company with expertise in artificial intelligence and machine learning. As of September 30, 2017, over 5,900 financial services organizations have signed agreements to deploy Mobile Deposit®. These include all of the top ten, and nearly all of the top 50 U.S. retail banks. The Company's solutions are embedded in native mobile apps and mobile optimized websites to facilitate better mobile user experiences and compliant transactions.

Mitek's Mobile Deposit® solution is used today by millions of consumers in the U.S. and Canada for mobile check deposit. Following the success of Mobile Deposit®, Mitek introduced a multi-check capture solution that enables businesses to deposit multiple checks in one batch using a mobile device. As of September 30, 2017, the Company has been granted 35 patents and it has an additional 16 patent applications pending.

Mitek is also applying its artificial intelligence and machine learning science to digital identity verification globally. Mitek’s Mobile Verify™ is empowering the digital transformation of companies by enabling them to identify with whom they are conducting business. To be in compliance with many governmental Know Your Customer and Anti-Money Laundering regulatory requirements around the globe identity verification is mandatory. In addition to regulated markets, digital identity verification is also becoming an imperative in the new trust based sharing economy.

The Company's identity verification solutions are for use with digital/mobile onboarding, trust establishment, and to facilitate money movement. Today, the financial services verticals (banks, credit unions, lenders, payments processors, card issuers, insurers, etc.) represent the most usage of our solutions, but we are also seeing growing adoption by telecommunications, healthcare, travel, retail, sharing economy, and online marketplaces.

The Company markets and sells its products and services worldwide through internal, direct sales teams located in the US and Europe, as well as through channel partners. The partner sales strategy includes channel partners who are financial services technology providers and identity verification providers. These partners integrate our products into their solutions to meet the needs of their customers.

Basis of Presentation

The financial statements are prepared under the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 105-10, Generally Accepted Accounting Principles, in accordance with accounting principles generally accepted in the U.S. (“GAAP”).

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

Foreign Currency

The Company has foreign subsidiaries that operate and sell products and services in various countries and jurisdictions around the world. As a result, the Company is exposed to foreign currency exchange risks. For those subsidiaries whose functional currency is not the U.S. dollar, assets and liabilities are translated into U.S. dollars equivalents at the exchange rate in effect on the balance sheet date and revenues and expenses are translated into U.S. dollars using the average exchange rate over the period. Resulting currency translation adjustments are recorded in accumulated other comprehensive income in the consolidated balance sheet. The Company recorded net gains resulting from foreign exchange translation of $208,000 for the fiscal year ended September 30, 2017 and net losses resulting from foreign exchange translation of $46,000 for the fiscal year ended September 30, 2016. There were no foreign exchange translation gains or losses recorded for the fiscal year ended September 30, 2015.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, expenses, deferred taxes, and related disclosure of contingent assets and liabilities. On an ongoing basis, management reviews its estimates based upon currently available information. Actual results could differ materially from those estimates. These estimates include, but are not limited to, assessing the collectability of accounts receivable, estimation of the value of stock-based compensation awards, fair value of assets and liabilities acquired, impairment of goodwill, useful lives of intangible assets, vendor specific objective evidence (“VSOE”) of fair value related to revenue recognition, and income taxes.

Goodwill and Purchased Intangible Assets

The Company’s goodwill resulted from the acquisition of IDchecker in fiscal year 2015. Goodwill and intangible assets with indefinite useful lives are not amortized, but are tested for impairment at least annually or as circumstances indicate that their value may no longer be recoverable. In accordance with ASC Topic 350, Intangibles—Goodwill and Other (“ASC Topic 350”), the Company reviews its goodwill and indefinite-lived intangible asset for impairment at least annually in its fiscal fourth quarter and more frequently if events or changes in circumstances occur that indicate a potential reduction in the fair value of its reporting unit and/or its indefinite-lived intangible asset below their respective carrying values. Examples of such events or circumstances include: a significant adverse change in legal factors or in the business climate, a significant decline in the Company’s stock price, a significant decline in the Company’s projected revenue or cash flows, an adverse action or assessment by a regulator, unanticipated competition, a loss of key personnel, or the presence of other indicators that would indicate a reduction in the fair value of a reporting unit.

The Company’s goodwill is considered to be impaired if management determines that the carrying value of the reporting unit to which the goodwill has been assigned exceeds management’s estimate of its fair value. Based on the guidance provided by ASC Topic 350 and ASC Topic 280, Segment Reporting (“ASC Topic 280”), management has determined that the Company operates in one segment and consists of one reporting unit given the similarities in economic characteristics between its operations and the common nature of its products, services and customers. Because the Company has only one reporting unit, and because the Company is publicly traded, the Company determines the fair value of the reporting unit based on its market capitalization as it believe this represents the best evidence of fair value. In the fourth quarter of fiscal 2017, management completed its annual goodwill impairment test and concluded that the Company’s goodwill was not impaired. The Company’s conclusion that goodwill was not impaired was based on a comparison of its net assets to its market capitalization.

Because the Company determines the fair value of its reporting unit based on its market capitalization, the Company’s future reviews of goodwill for impairment may be impacted by changes in the price of its common stock. For example, a significant decline in the price of the Company’s common stock may cause the fair value of its goodwill to fall below its carrying value. Therefore, the Company cannot assure you that when it completes its future reviews of goodwill for impairment a material impairment charge will not be recorded.

Net Income Per Share

The Company calculates net income per share in accordance with FASB ASC Topic 260, Earnings per Share. Basic net income per share is based on the weighted average number of common shares outstanding during the period. Diluted net income per share also gives effect to all potentially dilutive securities outstanding during the period, such as options, warrants, and restricted stock units (“RSUs”), if dilutive. In a period with a net loss position, potentially dilutive securities are not included in the computation of diluted net loss because to do so would be antidilutive, and the number of shares used to calculate basic and diluted net loss is the same.

For the fiscal years ended September 30, 2017, 2016 and 2015, the following potentially dilutive common shares were excluded from the net income per share calculation, as they would have been antidilutive (amounts in thousands):



	2017	2016	2015
Stock options	569	1,259	2,203
Restricted stock units	83	624	287
IDchecker closing shares	—	349	63
IDchecker earnout shares	24	—	—
Total potentially dilutive common shares outstanding	676	2,232	2,553

The computation of basic and diluted net income per share for the fiscal years ended September 30, 2017, 2016, and 2015 is as follows (amounts in thousands, except per share data):



	2017		2016		2015
Net income	$	14,092	$	1,959	$	2,526
Weighted-average common shares and share equivalents outstanding—basic	33,083		31,587		30,790
Dilutive potential common stock equivalents	2,454		2,232		690
Weighted-average common shares and share equivalents outstanding—diluted	35,537		33,819		31,480
Net income per share:
Basic	$	0.43	$	0.06	$	0.08
Diluted	$	0.40	$	0.06	$	0.08

Revenue Recognition

Revenue from sales of software licenses sold through direct and indirect channels is recognized upon shipment of the related product, if the requirements of FASB ASC Topic 985-605, Software Revenue Recognition (“ASC 985-605”) are met, including evidence of an arrangement, delivery, fixed or determinable fee, collectability, and VSOE of the fair value of the undelivered element. If the requirements of ASC 985-605 are not met at the date of shipment, revenue is not recognized until such elements are known or resolved. Revenue from customer support services, or maintenance revenue, includes post-contract support and the rights to unspecified upgrades and enhancements. VSOE of fair value for customer support services is determined by reference to the price the customer pays for such element when sold separately; that is, the renewal rate offered to customers. In those instances when objective and reliable evidence of fair value exists for the undelivered items but not for the delivered items, the residual method is used to allocate the arrangement consideration. Under the residual method, the amount of arrangement consideration allocated to the delivered items equals the total arrangement consideration less the aggregate fair value of the undelivered items. Revenue from post-contract customer support is recognized ratably over the term of the contract. Certain customers have agreements that provide for usage fees above fixed minimums. Usage fees above fixed minimums are recognized as revenue when such amounts are reasonably estimable and billable. Revenue from professional services is recognized when such services are delivered. When a software sales arrangement requires professional services related to significant production, modification, or customization of software, or when a customer considers professional services essential to the functionality of the software product, revenue is recognized based on predetermined milestone objectives required to complete the project, as those milestone objectives are deemed to be substantive in relation to the work performed. Any expected losses on contracts in progress are recorded in the period in which the losses become probable and reasonably estimable.

The Company provides hosting services that give customers access to software that resides on its servers. The Company’s model typically includes an up-front fee and a monthly commitment from the customer that commences upon completion of the implementation through the remainder of the customer life. The up-front fee is the initial setup fee, or the implementation fee. The monthly commitment includes, but is not limited to, a fixed monthly fee or a transactional fee based on system usage that exceeds monthly minimums. The Company does not view the signing of the contract or the provision of initial setup services as discrete earnings events that have stand-alone value. Revenue is typically deferred until the date the customer commences use of services, at which point the up-front fees are recognized ratably over the life of the customer arrangement.

Cash and Cash Equivalents

Cash and cash equivalents are defined as highly liquid financial instruments with original maturities of three months or less. A substantial portion of the Company’s cash is deposited with one financial institution. The Company monitors the financial condition of this financial institution and does not believe that funds on deposit are subject to a significant degree of risk.

Investments

Investments consist of corporate notes and bonds, commercial paper, and U.S. Treasury securities. The Company classifies investments as available-for-sale at the time of purchase and reevaluates such classification as of each balance sheet date. All investments are recorded at estimated fair value. Unrealized gains and losses for available-for-sale securities are included in accumulated other comprehensive income, a component of stockholders’ equity. The Company evaluates its investments to assess whether those with unrealized loss positions are other-than-temporarily impaired. Impairments are considered to be other-than-temporary if they are related to deterioration in credit risk or if it is likely that the Company will sell the securities before the recovery of its cost basis. Realized gains and losses and declines in value judged to be other-than-temporary are determined based on the specific identification method and are reported in other income (expense), net in the statements of other comprehensive income. No other-than-temporary impairment charges were recognized in the fiscal years ended September 30, 2017, 2016 and 2015.

All investments whose maturity or sale is expected within one year are classified as “current” on the Consolidated Balance Sheet. All other securities are classified as “long-term” on the Consolidated Balance Sheet.

Fair Value Measurements

The carrying amounts of cash equivalents, investments, accounts receivable, accounts payable, and other accrued liabilities are considered representative of their respective fair values because of the short-term nature of those instruments.

Accounts Receivable and Allowance for Doubtful Accounts

Trade accounts receivable are recorded at the net invoice value and are not interest bearing. The Company considers receivables past due based on the contractual payment terms. Allowances for doubtful accounts are established based on various factors including credit profiles of the Company’s customers, contractual terms and conditions, historical payments, and current economic trends. The Company reviews its allowances by assessing individual accounts receivable over a specific aging and amount. Accounts receivable are written off on a case-by-case basis, net of any amounts that may be collected. The Company had no write-offs of the allowance for doubtful accounts for the fiscal years ended September 30, 2017, 2016, and 2015, respectively. The Company maintained an allowance for doubtful accounts of $31,000 and $35,000 as of September 30, 2017 and 2016, respectively.

Deferred Maintenance Fees

Deferred maintenance fees consist of capitalized costs associated with software maintenance fees paid to vendors who supply licenses and maintenance for software embedded in the Company’s products that it sells to customers. These software maintenance fees, which are included in other current assets on the balance sheet, are typically billed annually to the Company and are amortized to cost of revenue-maintenance and professional services in the Consolidated Statements of Operations and Other Comprehensive Income over the maintenance period, which is typically one year.

Property and Equipment

Property and equipment are carried at cost. The following is a summary of property and equipment as of September 30, 2017 and 2016 (amounts shown in thousands):



	2017			2016
Property and equipment—at cost:
Equipment	$	1,801		$	1,492
Furniture and fixtures	257			248
Leasehold improvements	1,128			1,021
	3,186			2,761
Less: accumulated depreciation and amortization	(2,573		)	(2,321		)
Total property and equipment, net	$	613		$	440

Depreciation and amortization of property and equipment are provided using the straight-line method over estimated useful lives ranging from three to five years. Leasehold improvements are amortized over the shorter of the lease term or estimated useful life of the assets. Depreciation and amortization of property and equipment totaled $0.3 million, $0.8 million, and $0.4 million for the fiscal years ended September 30, 2017, 2016, and 2015, respectively. Expenditures for repairs and maintenance are charged to operations. Total repairs and maintenance expenses were $0.2 million, $0.2 million and $0.1 million for the fiscal years ended September 30, 2017, 2016, and 2015, respectively.

Long-Lived Assets

The Company evaluates the carrying value of long-lived assets, including license agreements and other intangible assets, when events and circumstances indicate that these assets may be impaired or in order to determine whether any revision to the related amortization periods should be made. This evaluation is based on management’s projections of the undiscounted future cash flows associated with each product or asset. If management’s evaluation indicates that the carrying values of these intangible assets were impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. The Company did not record any impairment for the fiscal years ended September 30, 2017, 2016, and 2015.

Capitalized Software Development Costs

Costs incurred for the development of software that will be sold, leased, or otherwise marketed are capitalized when technological feasibility has been established. Software development costs consist primarily of compensation of development personnel and related overhead incurred to develop new products and upgrade and enhance the Company’s current products, as well as fees paid to outside consultants. Capitalization of software development costs ceases and amortization of capitalized software development costs commences when the products are available for general release. For the fiscal years ended September 30, 2017 and 2016, no software development costs were capitalized because the time period and cost incurred between technological feasibility and general release for all software product releases were not material. We had no amortization expense from capitalized software costs during the years ended September 30, 2017, 2016, or 2015.

Costs related to software acquired, developed, or modified solely to meet our internal requirements, with no substantive plans to market such software at the time of development, are capitalized. Costs incurred during the preliminary planning and evaluation stage of the project and during post implementation operational stage are expensed as incurred. Costs incurred during the application development stage of the project are capitalized. The Company defines the design, configuration, and coding process as the application development stage. The Company did not capitalize any costs related to computer software developed for internal use during the years ended September 30, 2017, 2016, or 2015.

Deferred Revenue

Deferred revenues represent advance payments or billings for software licenses, professional services, and maintenance billed in advance of the time we recognize the related revenues. Deferred maintenance revenue represents customer billings, paid up front, generally annually at the beginning of each maintenance period, with revenue recognized ratably over such period. For certain other licensing arrangements, revenue attributable to undelivered elements, including post-contract customer support which typically includes telephone support and the right to receive unspecified upgrades and enhancements of software on a when-and-if-available basis, is based upon the sales price of those elements when sold separately and is recognized ratably on a straight-line basis over the term of the arrangement.

Guarantees

In the ordinary course of business, the Company is not subject to potential obligations under guarantees that fall within the scope of FASB ASC Topic 460, Guarantees (“ASC 460”), except for standard indemnification and warranty provisions that are contained within many of the Company’s customer license and service agreements and certain supplier agreements, and give rise only to the disclosure requirements prescribed by ASC 460. Indemnification and warranty provisions contained within the Company’s customer license and service agreements and certain supplier agreements are generally consistent with those prevalent in the Company’s industry. The Company has not historically incurred significant obligations under customer indemnification or warranty provisions and does not expect to incur significant obligations in the future. Accordingly, the Company does not maintain accruals for potential customer indemnification or warranty-related obligations.

Loss Contingencies

The Company records its best estimates of a loss contingency when it is considered probable and the amount can be reasonably estimated. When a range of loss can be reasonably estimated with no best estimate in the range, the Company records the minimum estimated liability related to the claim. As additional information becomes available, the Company assesses the potential liability related to the Company’s pending loss contingency and revises its estimates. The Company discloses contingencies if there is at least a reasonable possibility that a material loss or a material additional loss may have been incurred. The Company’s legal costs are expensed as incurred.

Income Taxes

The Company accounts for income taxes in accordance with FASB ASC Topic 740, Income Taxes (“ASC 740”). Deferred tax assets and liabilities arise from temporary differences between the tax bases of assets and liabilities and their reported amounts in the financial statements that will result in taxable or deductible amounts in future years.

Management evaluates the available evidence about future taxable income and other possible sources of realization of deferred tax assets. The valuation allowance reduces deferred tax assets to an amount that represents management’s best estimate of the amount of such deferred tax assets that more likely than not will be realized. See Note 6 for additional details.

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the tax authorities, based on the technical merits of the position. The tax benefit is measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. The Company recognizes interest and penalties related to income tax matters in income tax expense. See Note 6 for additional details.

Stock-Based Compensation

The Company records stock-based compensation in accordance with FASB ASC Topic 718, Compensation-Stock Compensation (“ASC 718”). The Company estimates the fair value of stock options using the Black-Scholes option pricing model. The fair value of stock options granted is recognized as an expense over the requisite service period. Stock-based compensation expense for all share-based payment awards is recognized using the straight-line single-option method.

The Black-Scholes option pricing model requires subjective assumptions, including future stock price volatility and expected time to exercise, which greatly affect the calculated values. The expected term of options granted is derived from historical data on employee exercises and post-vesting employment termination behavior. The risk-free rate selected to value any particular grant is based on the U.S. Treasury rate that corresponds to the expected life of the grant effective as of the date of the grant. The expected volatility is based on the historical volatility of the Company’s stock price. These factors could change in the future, affecting the determination of stock-based compensation expense in future periods.

Advertising Expense

Advertising costs are expensed as incurred and totaled $0.3 million, $0.2 million and $0.2 million during the fiscal years ended September 30, 2017, 2016, and 2015, respectively.

Research and Development

Research and development costs are expensed in the period incurred.

Leases

Leases are reviewed and classified as capital or operating at their inception. For leases that contain rent escalations, the Company records the total rent payable on a straight-line basis over the term of the lease. The difference between rent payments and straight-line rent expense is recorded as deferred rent.

Segment Reporting

FASB ASC Topic 280, Segment Reporting, requires the use of a management approach in identifying segments of an enterprise. During the fiscal year ended September 30, 2017, management determined that the Company has only one operating segment: the development, sale and service of proprietary software solutions related to mobile imaging.

Comprehensive Income

Comprehensive income consists of net income and unrealized gains and losses on available-for-sale securities and foreign currency translation adjustments. The following table summarizes the components of comprehensive loss for the fiscal years ended September 30, 2017, 2016, and 2015 (amounts shown in thousands):



	2017			2016			2015
Net income	$	14,092		$	1,959		$	2,526
Other comprehensive income:
Foreign currency translation adjustment	208			(46		)	—
Change in unrealized gains (losses) on marketable securities	(19		)	7			5
Total comprehensive income	$	14,281		$	1,920		$	2,531

Included on the balance sheet at September 30, 2017 is an accumulated other comprehensive income of $147,000, compared to an accumulated other comprehensive loss of $42,000 at September 30, 2016.

Recently Adopted Accounting Pronouncements

In September 2015, the FASB issued Accounting Standards Update (“ASU”) No. 2015-16, Simplifying the Accounting for Measurement-Period Adjustments (Topic 805) (“ASU 2015-16”) which eliminates the requirement to restate prior period financial statements for measurement period adjustments. ASU 2015-16 requires that the cumulative impact of a measurement period adjustment (including the impact on prior periods) be recognized in the reporting period in which the adjustment is identified. The new standard is effective for interim and annual periods beginning after December 15, 2015 and early adoption is permitted. The Company adopted the standard prospectively as of October 1, 2016. The adoption of ASU 2015-16 did not have a material impact on the results of operations, financial condition, or cash flows of the Company.

Recently Issued Accounting Pronouncements

In May 2017, the FASB issued ASU No. 2017-09, Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting ("ASU 2017-09"), which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. ASU 2017-09 requires entities to account for the effects of a modification unless the fair value, vesting conditions, and classification of the modified award are all the same as the original award immediately before the original award is modified. ASU 2017-09 is effective for interim and annual reporting periods beginning after December 15, 2017 with early adoption permitted. The Company does not expect the adoption of ASU 2017-09 to have a material impact on its consolidated financial statements.

In January 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”), which eliminates Step 2 of the goodwill impairment test that had required a hypothetical purchase price allocation. Rather, entities should apply the same impairment assessment to all reporting units and recognize an impairment loss for the amount by which a reporting unit's carrying amount exceeds its fair value, without exceeding the total amount of goodwill allocated to that reporting unit. Entities will continue to have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 will be effective prospectively for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019, or those beginning after January 1, 2017 if adopted early. The Company does not expect the adoption of ASU 2017-04 to have a material impact on its consolidated financial statements.

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (“ASU 2017-01”), which clarifies the definition of a business with the objective of adding guidance and providing a more robust framework to assist reporting organizations with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. For public entities, ASU 2017-01 is effective prospectively for fiscal years, including interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted for transactions occurring before the issuance or effective date of the standard for which financial statements have not yet been issued. The Company does not expect the adoption of ASU 2017-01 to have a material impact on its consolidated financial statements.

In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (Topic 740) (“ASU 2016-16”), which requires entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. ASU 2016-16 is effective for interim and annual reporting periods beginning after December 15, 2017 with early adoption permitted. The Company is currently evaluating the impact ASU 2016-16 will have on its consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), which requires entities to use a Current Expected Credit Loss model which is a new impairment model based on expected losses rather than incurred losses. Under this model, an entity would recognize an impairment allowance equal to its current estimate of all contractual cash flows that the entity does not expect to collect from financial assets measured at amortized cost. The entity's estimate would consider relevant information about past events, current conditions and reasonable and supportable forecasts. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 31, 2019 with early adoption permitted for annual reporting periods beginning after December 31, 2018. The Company is currently evaluating the impact ASU 2016-13 will have on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Compensation – Stock Compensation (Topic 718) (“ASU 2016-09”), which simplified certain aspects of the accounting for share-based payment transactions, including income taxes, classification of awards and classification in the statement of cash flows. ASU 2016-09 will be effective for the Company beginning in its first quarter of fiscal 2018. The Company does not expect the adoption of ASU 2016-09 to have a material impact on its consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which modified lease accounting for both lessees and lessors to increase transparency and comparability by recognizing lease assets and lease liabilities by lessees for those leases classified as operating leases under previous accounting standards and disclosing key information about leasing arrangements. ASU 2016-02 will be effective for the Company beginning in its first quarter of fiscal 2020 and early adoption is permitted. The Company is currently evaluating the timing of its adoption and the impact of adopting the new lease standard on its consolidated financial statements.

In May 2014, the FASB issued guidance codified in FASB ASC Topic 606, Revenue Recognition – Revenue from Contracts with Customers, which amends the guidance in former ASC 605, Revenue Recognition. The Company has performed a review of the requirements of the new revenue standard and related ASUs and is monitoring the activity of the FASB and the transition resource group as it relates to specific interpretive guidance. The Company is reviewing customer contracts and is in the process of applying the new revenue standard to its key identified revenue streams included within either software revenue or SaaS, maintenance, and consulting revenue and is comparing the results to its current accounting practices. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2019. Entities have the option of adopting this new guidance using either a full retrospective or a modified approach with the cumulative effect of applying the guidance recognized at the date of initial application. The Company is currently evaluating the transition method to elect as well as necessary control and process changes due to implementing the new revenue standard.

No other new accounting pronouncement issued or effective during the year ended September 30, 2017 had, or is expected to have, a material impact on the Company’s consolidated financial statements.

BUSINESS COMBINATION

12 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

BUSINESS COMBINATION

On June 17, 2015, the Company completed the acquisition (the “IDC Acquisition”) of IDchecker NL B.V., a company incorporated under the laws of The Netherlands (“IDC NL”), and ID Checker, Inc., a California corporation and wholly owned subsidiary of IDC NL (“IDC Inc.” and together with IDC NL, “IDchecker”), pursuant to a Share Purchase Agreement (the “Share Purchase Agreement”) dated May 26, 2015, by and among the Company, IDC NL, ID Checker Holding B.V. (“Parent”), Stichting Administratiekantoor OPID (together with Parent, the “Sellers”), and the other individuals specified therein. Upon completion of the IDC Acquisition, IDC NL and IDC Inc. became wholly owned subsidiaries of the Company and the transaction was accounted for as an acquisition of a business. IDchecker is a provider of cloud-based identification document verification services. During the fourth quarter of fiscal 2017, IDC NL changed its name to Mitek Systems, B.V and became a wholly owned subsidiary of Mitek Holding B.V., a company incorporated under the laws of The Netherlands and a wholly owned subsidiary of the Company.

Pursuant to the terms of the Share Purchase Agreement, the Company acquired all of the issued and outstanding shares of IDC NL and IDC Inc. At the closing of the IDC Acquisition, the Company paid a purchase price of $5.9 million, which consisted of (i) a cash payment to the Sellers of $5.6 million, subject to adjustments for transaction expenses, indebtedness, and working capital adjustments (the “Cash Payment”) and (ii) the forgiveness of the outstanding balance of approximately $0.3 million on a promissory note issued by the Company to Parent. Approximately $2.7 million in shares of the Company’s common stock (the “Closing Shares”), or 712,790 shares, were issued to the Sellers at the closing of the IDC Acquisition. In January 2016, the Company issued 137,306 additional shares (the “Earnout Shares”), to the Sellers for achievement by IDchecker of certain revenue and net income targets for the nine-month period ended September 30, 2015. Additionally, 81,182 Earnout Shares were earned by the Sellers for achievement by IDchecker of certain revenue and net income targets for the twelve-month period ended September 30, 2016. Vesting of both the Closing Shares and Earnout Shares is subject to the continued employment of the founders of IDchecker and such shares are being accounted for as compensation for future services in accordance with FASB ASC Topic 718, Compensation – Stock Compensation. For additional information regarding the Closing Shares and Earnout Shares, see Note 5 to the Company’s consolidated financial statements.

Upon the closing of the IDC Acquisition, the Company deposited $1.8 million of the Cash Payment and 20% of the Closing Shares into an escrow fund to serve as collateral and partial security for working capital adjustments and certain indemnification rights. In January 2016, the Company also deposited 27,461 Earnout Shares into an escrow fund. Additionally, when the Earnout Shares are issued in respect of the twelve-month period ended September 30, 2016, 20% of such Earnout Shares will be added to the escrow fund. The escrow fund will be maintained until the date that is 24 months after the Earnout Shares for the twelve-month period ended September 30, 2016 are issued or until such earlier time as the escrow fund is exhausted. During the fourth quarter of Fiscal 2017, the $1.8 million escrow funds and the Closing Shares held in escrow were released to the Sellers.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as part of the IDC Acquisition as of June 17, 2015 (amounts shown in thousands):



	June 17, 2015
Current assets	$	620
Property, plant and equipment	42
Intangible assets	3,570
Assets acquired	$	4,232
Current liabilities	$	(476	)
Other liabilities	(810		)
Liabilities assumed	$	(1,286	)
Fair value of net assets acquired	$	2,946
Total consideration paid	5,819
Goodwill before effect in exchange rates as of June 17, 2015	$	2,873
Effect of movements in exchange rates as of September 30, 2017	141
Goodwill as of September 30, 2017	$	3,014

The Company estimated the fair value of identifiable acquisition-related intangible assets primarily based on discounted cash flow projections that will arise from these assets. The Company exercised significant judgment with regard to assumptions used in the determination of fair value such as with respect to discount rates and the determination of the estimated useful lives of the intangible assets, (see Note 4 to the Company’s consolidated financial statements). The excess of the purchase price over the fair value of the assets acquired and liabilities assumed was allocated to goodwill. Goodwill in the amount of $2.9 million was recorded in the Consolidated Balance Sheets at the date of the IDC Acquisition. The goodwill recognized was due to expected synergies and other factors and is not expected to be deductible for income tax purposes.

INVESTMENTS

12 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]

INVESTMENTS

The Company determines the appropriate designation of investments at the time of purchase and reevaluates such designation as of each balance sheet date. All of the Company’s investments are designated as available-for-sale debt securities. As of September 30, 2017 and 2016, the Company’s short-term investments have maturity dates of greater than 90 days and less than one year from the balance sheet date. The Company’s long-term investments have maturity dates of greater than one year from the balance sheet date.

Available-for-sale marketable securities are carried at fair value as determined by quoted market prices for identical or similar assets, with unrealized gains and losses, net of tax, and reported as a separate component of stockholders’ equity. Management reviews the fair value of the portfolio at least monthly, and evaluates individual securities with fair value below amortized cost at the balance sheet date. For debt securities, in order to determine whether impairment is other-than-temporary, management must conclude whether the Company intends to sell the impaired security and whether it is more likely than not that the Company will be required to sell the security before recovering its amortized cost basis. If management intends to sell an impaired debt security or it is more likely than not the Company will be required to sell the security prior to recovering its amortized cost basis, an other-than-temporary impairment is deemed to have occurred. The amount of an other-than-temporary impairment related to a credit loss, or securities that management intends to sell before recovery, is recognized in earnings. The amount of an other-than-temporary impairment on debt securities related to other factors is recorded consistent with changes in the fair value of all other available-for-sale securities as a component of stockholders’ equity in other comprehensive income. No other-than-temporary impairment charges were recognized in the fiscal years ended September 30, 2017, 2016, and 2015.

The cost of securities sold is based on the specific identification method. Amortization of premiums, accretion of discounts, interest, dividend income, and realized gains and losses are included in investment income.

The following tables summarize investments by security type as of September 30, 2017 and 2016 (amounts shown in thousands):



	September 30, 2017
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
US Treasury	$	3,897	$	—	$	(3	)	$	3,894
Corporate debt securities, short-term	26,393		—		(8		)	26,385
Corporate debt securities, long-term	3,785		—		(5		)	3,780
Total	$	34,075	$	—	$	(16	)	$	34,059



	September 30, 2016
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
U.S. Treasury, short-term	$	12,907	$	8	$	—		$	12,915
Corporate debt securities, short-term	11,949		2		(3		)	11,948
Corporate debt securities, long-term	1,954		1		(3		)	1,952
Total	$	26,810	$	11	$	(6	)	$	26,815

Fair Value Measurements and Disclosures

FASB ASC Topic 820, Fair Value Measurements (“ASC 820”) defines fair value, establishes a framework for measuring fair value under GAAP and enhances disclosures about fair value measurements. Fair value is defined under ASC 820 as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value under ASC 820 must maximize the use of observable inputs and minimize the use of unobservable inputs. ASC 820 describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value which consists of the following:


•	Level 1—Quoted prices in active markets for identical assets or liabilities;


•	Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and


•	Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Fair value measurements are classified according to the lowest level input or value-driver that is significant to the valuation. A measurement may therefore be classified within Level 3 even though there may be significant inputs that are readily observable.

Because many fixed income securities do not trade on a daily basis or have market prices from multiple sources, the pricing applications may apply available information as applicable to determine the fair value as of the measurement date. This methodology applies to the Company’s Level 2 investments. Currently, the Company does not hold any Level 3 investments.

The Company recorded an acquisition-related liability for contingent consideration representing the amounts payable to former IDchecker shareholders, as outlined under the terms of the Share Purchase Agreement, subject to the achievement of certain revenue and net income targets by IDchecker for the nine-month period ended on September 30, 2015, and the twelve-month period ended September 30, 2016. The fair value of this Level 3 liability is estimated using the Monte-Carlo simulation (using the Company’s stock price, the annual risk-free interest rate, expected volatility, the probability of reaching the performance targets and a 10 trading day average stock price). Subsequent changes in the fair value of the contingent consideration liability were recorded in the consolidated statement of operations and comprehensive income and resulted from updates to assumed probability of achievement of the performance targets and adjustments to the inputs discussed previously.

The following tables represent the fair value hierarchy of the Company’s investments and acquisition-related contingent consideration as of September 30, 2017 and 2016 (amounts shown in thousands):



	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2017:
Assets:
Short-term investments:
U.S. Treasury	$	3,894	$	3,894	$	—	$	—
Corporate debt securities
Financial	3,041		—		3,041		—
Industrial	9,503		—		9,503		—
Commercial paper
Financial	10,850		—		10,850		—
Industrial	2,991		—		2,991		—
Total short-term investments at fair value	30,279		3,894		26,385		—
Long-term investments:
U.S. Treasury	—		—		—		—
Corporate debt securities
Financial	1,858		—		1,858		—
Industrial	1,922		—		1,922		—
Total assets at fair value	$	34,059	$	3,894	$	30,165	$	—
Liabilities:
Acquisition-related contingent consideration	354		—		—		354
Total liabilities at fair value	$	354	$	—	$	—	$	354



	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2016:
Assets:
Short-term investments:
U.S. Treasury	$	12,915	$	12,915	$	—	$	—
Corporate debt securities
Financial	3,963		—		3,963		—
Industrial	4,445		—		4,445		—
Commercial paper
Financial	2,843		—		2,843		—
Industrial	697		—		697		—
Total short-term investments at fair value	24,863		12,915		11,948		—
Long-term investments:
Corporate debt securities
Financial	502		—		502		—
Industrial	1,450		—		1,450		—
Total assets at fair value	$	26,815	$	12,915	$	13,900	$	—
Liabilities:
Acquisition-related contingent consideration	252		—		—		252
Total liabilities at fair value	$	252	$	—	$	—	$	252

The following table includes a summary of the Acquisition-related contingent consideration measured at fair value using significant unobservable inputs (Level 3) during the year ended September 30, 2017 (amounts shown in thousands):



Balance at September 30, 2016	$	252
Expenses recorded due to changes in fair value	412
Issuance of common stock	(310		)
Balance at September 30, 2017	$	354

GOODWILL AND INTANGIBLE ASSETS

12 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

Goodwill

The Company has goodwill balances of $3.0 million and $2.9 million at September 30, 2017 and 2016, respectively, associated with the IDC Acquisition which occurred during 2015. For information regarding the IDC Acquisition, see Note 2. Goodwill represents the excess of costs over fair value of assets of businesses acquired. Goodwill acquired in a business combination and determined to have an indefinite useful life is not amortized, but instead is tested for impairment at least annually in accordance with the FASB ASC Topic 350, Intangibles – Goodwill and Other. The Company has concluded that no impairment of goodwill exists as of September 30, 2017.

Intangible assets

Intangible assets include the value assigned to completed technology, customer relationships, and trade names. The estimated useful lives for all of these intangible assets, range from five to six years. Intangible assets as of September 30, 2017 are summarized as follows (amounts shown in thousands, except for years):



	Weighted Average Amortization Period	Cost		Accumulated Amortization		Net
Completed technologies	6 years	$	2,370	$	833	$	1,537
Customer relationships	6 years	970		341		629
Trade names	5 years	230		99		131
Total intangible assets		$	3,570	$	1,273	$	2,297

Amortization expense related to acquired intangible assets was $0.6 million, $0.6 million, and $0.2 million for fiscal years ended September 30, 2017, 2016, and 2015, respectively.

The estimated future amortization expense related to intangible assets for each of the five succeeding fiscal years is expected to be as follows (amounts shown in thousands):



	Estimated Future Amortization Expense
2018	$	632
2019	632
2020	618
2021	415
2022	—
	$	2,297

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

STOCKHOLDERS' EQUITY

12 Months Ended

Sep. 30, 2017

Equity [Abstract]

STOCKHOLDERS' EQUITY

STOCKHOLDERS’ EQUITY

Stock-based Compensation

The Company applies the fair value recognition provisions of ASC 718. The fair value of stock options granted to employees and directors is calculated using the Black-Scholes option pricing model. The Black-Scholes option pricing model requires subjective assumptions, including future stock price volatility and expected time to exercise, which greatly affect the calculated values. The expected term of options granted is derived from historical data on employee exercises and post-vesting employment termination behavior. The risk-free rate selected to value any particular grant is based on the U.S. Treasury rate that corresponds to the expected life of the grant effective as of the date of the grant. The expected volatility is based on the historical volatility of the Company’s stock price. These factors could change in the future, affecting the determination of stock-based compensation expense in future periods.

The value of stock-based compensation is based on the single option valuation approach under ASC 718. It is assumed no dividends will be declared. The estimated fair value of stock-based compensation awards is amortized using the straight-line method over the vesting period of the option.

ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The estimated average forfeiture rate for the fiscal year ended September 30, 2017 of 12% for all stock option grants was based on historical forfeiture experience.

ASC 718 requires the cash flows from tax benefits resulting from tax deductions in excess of the compensation cost recognized for options to be classified as financing cash flows. Due to the Company’s valuation allowance from losses in the previous years, there were no such tax benefits during the fiscal years ended September 30, 2017, 2016, and 2015.

The fair value calculations for stock-based compensation awards to employees for the fiscal years ended September 30, 2017, 2016, and 2015 were based on the following assumptions:



	2017	2016	2015
Risk-free interest rate	1.68% – 1.92%	1.43% – 1.66%	1.29% – 1.66%
Expected life (years)	5.25	5.90	5.30
Expected volatility	74%	83%	90%
Expected dividends	None	None	None

The following table summarizes stock-based compensation expense under ASC 718 for the fiscal years ended September 30, 2017, 2016, and 2015, which were allocated as follows (amounts shown in thousands):



	2017		2016		2015
Cost of revenue	$	52	$	39	$	30
Sales and marketing	1,577		1,099		713
Research and development	1,028		660		592
General and administrative	2,821		2,281		2,032
Stock-based compensation expense related to employee stock options included in expenses	$	5,478	$	4,079	$	3,367

As of September 30, 2017, the Company had $10.7 million of unrecognized compensation expense related to outstanding stock options and RSUs expected to be recognized over a weighted-average period of approximately 2.0 years.

2012 Incentive Plan

In January 2012, the Company’s board of directors (the “Board”) adopted the Mitek Systems, Inc. 2012 Incentive Plan (the “2012 Plan”), upon the recommendation of the compensation committee of the Board. On March 10, 2017, the Company’s stockholders approved the amendment and restatement of the 2012 Plan which increased the total number of shares of common stock reserved for issuance thereunder from 6,000,000 shares to 9,500,000 shares plus that number of shares of common stock that would otherwise return to the available pool of unissued shares reserved for awards under its 1999 Stock Option Plan, 2000 Stock Option Plan, 2002 Stock Option Plan, 2006 Stock Option Plan and 2010 Stock Option Plan (collectively, the “Prior Plans”). As of September 30, 2017, (i) stock options to purchase 1,769,138 shares of common stock, 1,803,165 RSUs, and 2,100,000 Senior Executive Performance RSUs were outstanding under the 2012 Plan, and 2,464,202 shares of common stock were reserved for future grants under the 2012 Plan and (ii) stock options to purchase an aggregate of 1,076,728 shares of common stock were outstanding under the Prior Plans.

Director Restricted Stock Unit Plan

In January 2011, the Board adopted the Mitek Systems, Inc. Director Restricted Stock Unit Plan, as amended and restated (the “Director Plan”), reserving up to 1,000,000 shares of common stock for the issuance of RSUs that may be granted to both employee and non-employee members of the Board. On March 10, 2017, the Company's stockholders approved an amendment to the Director Plan which increased the total number of shares of common stock reserved for issuance thereunder from 1,000,000 shares to 1,500,000 shares and extended the term of the Director Plan from December 5, 2020 to December 31, 2022. As of September 30, 2017, (i) 553,856 RSUs were outstanding under the Director Plan and (ii) 521,315 shares of common stock were reserved for future grants under the Director Plan.

Stock Options

The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2017, 2016, and 2015:



	Number of Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (in Years)
Outstanding, September 30, 2014	2,334,326		$	4.11	5.5
Granted	1,927,500		$	2.92
Exercised	(232,203	)	$	1.06
Cancelled	(381,918	)	$	3.85
Outstanding, September 30, 2015	3,647,705		$	3.70	7.2
Granted	98,500		$	4.51
Exercised	(661,663	)	$	2.67
Cancelled	(69,168	)	$	4.51
Outstanding, September 30, 2016	3,015,374		$	3.95	6.4
Granted	147,800		$	7.06
Exercised	(235,514	)	$	2.92
Cancelled	(81,794	)	$	3.59
Outstanding, September 30, 2017	2,845,866		$	4.21	5.4

The Company recognized $1.0 million, $1.3 million, and $2.2 million in stock-based compensation expense related to outstanding stock options in the fiscal years ended September 30, 2017, 2016, and 2015, respectively. As of September 30, 2017, the Company had $1.3 million of unrecognized compensation expense related to outstanding stock options expected to be recognized over a weighted average period of approximately 1.5 years.

Aggregate intrinsic value represents the value of the Company’s closing stock price on the last trading day of the fiscal period in excess of the weighted-average exercise price, multiplied by the number of options outstanding and exercisable. The total intrinsic value of options exercised during the fiscal years ended September 30, 2017, 2016, and 2015 was $1.4 million, $3.3 million, and $0.6 million, respectively. The per-share weighted average fair value of options granted during the fiscal years ended September 30, 2016 and 2015 was $4.28, $3.29, and $2.83, respectively. The aggregate intrinsic value of options outstanding as of September 30, 2017 and 2016, was $15.6 million and $14.2 million, respectively.

Restricted Stock Units

The following table summarizes RSU activity in the fiscal years ended September 30, 2017, 2016, and 2015:



	Number of shares		Weighted- average fair value per share
Outstanding at September 30, 2014	1,101,303		$	4.71
Granted	104,000		$	2.29
Settled	(255,041	)	$	2.96
Cancelled	(147,345	)	$	3.54
Outstanding at September 30, 2015	802,917		$	4.49
Granted	1,536,000		$	4.82
Settled	(261,621	)	$	4.77
Cancelled	(31,127	)	$	4.19
Outstanding at September 30, 2016	2,046,169		$	4.90
Granted	1,249,224		$	6.61
Settled	(707,174	)	$	4.81
Cancelled	(231,198	)	$	4.93
Outstanding at September 30, 2017	2,357,021		$	5.65

The cost of RSUs is determined using the fair value of the Company’s common stock on the award date, and the compensation expense is recognized ratably over the vesting period. The Company recognized $4.0 million, $2.7 million, and $1.2 million in stock-based compensation expense related to outstanding RSUs in the fiscal years ended September 30, 2017, 2016, and 2015, respectively. As of September 30, 2017, the Company had approximately $9.3 million of unrecognized compensation expense related to outstanding RSUs expected to be recognized over a weighted-average period of approximately 2.6 years.

Senior Executive Performance RSUs

In the year ended September 30, 2017, the Company granted 2,400,000 Senior Executive Long Term Incentive Restricted Stock Units ("Senior Executive Performance RSUs") under the 2012 Plan. 300,000 Senior Executive Performance RSUs granted to the Company's former Chief Financial Officer were canceled as a result of his resignation effective July 1, 2017. Senior Executive Performance RSUs are purely performance-based, and no Senior Executive Performance RSUs vest unless, as of the end of the performance period (March 1, 2017 through the date that is 25 trading days after the first filing of an Annual Report on Form 10-K or Quarterly Report on Form 10-Q by the Company following September 30, 2019 (the “Performance Period”)) or in connection with a Change of Control (as defined the in 2012 Plan), a significant threshold level of stock price appreciation (or the equivalent in connection with a Change of Control that takes the form of an asset sale) has been achieved by the Company. Furthermore, the number of Senior Executive Performance RSUs that ultimately vest at the end of the Performance Period depends on whether the percentage increase in the Company’s stock price during the Performance Period equaled or outperformed the percentage increase in the Russell 2000 Index over the same period.

The Senior Executive Performance RSUs will fully vest if the following market conditions are met: (i) the Company achieves a stock price of $20.00 per share or more at the end of the Performance Period, which is expected to end in January 2020; and (ii) the Company’s stock price growth during the Performance Period equaled or outperformed the stock price growth of the Russell 2000 Index. For stock prices between $16.00 per share and $20.00 per share, vesting will range (i) between 25% and 50% if the percentage increase in the Company’s stock price during the Performance Period was lower than the percentage increase of the Russell 2000 Index and (ii) between 50% and 100% if the percentage increase in the Company’s stock price during the Performance Period equaled or outperformed the percentage increase of the Russell 2000 Index, in each case, with higher vesting relating to increased stock prices, determined on the basis of a straight line interpolation. No Senior Executive Performance RSUs will vest if the Company’s stock price at the end of the Performance Period is below $16.00 per share and all unvested Senior Executive Performance RSUs shall be canceled. Upon cancellation, the shares subject to such Senior Executive Performance RSUs will not be returned to the 2012 Plan and will not be available for issuance under other types of Awards. Fifty percent of the Senior Executive Performance RSUs determined at the end of the Performance Period convert into unrestricted shares (one share per RSU). The remaining 50% of the Senior Executive Performance RSUs vest subject to the participants’ continued employment through the one-year anniversary of the end of the Performance Period; provided, however that such remaining Senior Executive Performance RSUs shall fully vest upon a qualifying termination or a change in control during such one-year period. Accordingly, the related stock-based compensation expense will be recognized over these respective vesting periods.

The Company estimated the fair value of the Senior Executive Performance RSUs on their grant date using the Monte-Carlo simulation (using the Company’s valuation date stock price, the annual risk-free interest rate, expected volatility, the probability of reaching the performance targets, and a 20-trading-day average stock price). The Company has estimated the aggregate fair value of the Senior Executive Performance RSUs at $4.2 million and recognized $0.4 million in stock-based compensation expense related to outstanding Senior Executive Performance RSUs during the fiscal year ended September 30, 2017.

Closing Shares

In connection with the closing of the IDC Acquisition in June 2015, the Company issued to the Sellers 712,790 shares of common stock. Vesting of these shares is subject to the continued employment of the founders of IDchecker and occurs over a period of 27 months (the “Service Period”) from the date of issuance. The cost of the Closing Shares is determined using the fair value of common stock on the award date, and the stock-based compensation is recognized ratably over the vesting period. Stock-based compensation expense related to the Closing Shares is recorded within acquisition-related costs and expenses on the Consolidated Statements of Operations and Other Comprehensive Income. The Company recognized $1.2 million, $1.2 million, and $0.3 million in stock-based compensation expense related to the Closing Shares for the fiscal years ended September 30, 2017, 2016, and 2015, respectively. As of September 30, 2017, the Company had no unrecognized compensation expense related to Closing Shares.

Earnout Shares

In addition to the Cash Payment and the issuance of Closing Shares, in each case at the closing of the IDC Acquisition, the Company issued 137,306 Earnout Shares to the Sellers for achievement by IDchecker of certain revenue targets for the nine-month period ended September 30, 2015. Additionally, 81,182 Earnout Shares were earned by the Sellers for achievement by IDchecker of certain revenue targets for the twelve-month period ended September 30, 2016. Earnout Shares vest and will be eligible for resale such that 12.5% of the Earnout Shares will vest and be released for resale on the date that is six months following the date of issue and thereafter, the remaining 87.5% of the applicable Earnout Shares will vest and be released for resale in equal quarterly installments. Vesting of the Earnout Shares is subject to the continued employment of the founders of IDchecker through the date on which all Earnout Shares are fully vested.

The Company estimated the fair value of the Earnout Shares using the Monte-Carlo simulation (using the Company’s valuation date stock price, the annual risk-free interest rate, expected volatility, the probability of reaching the performance targets and a 10 trading day average stock price). This model will be updated and the respective fair value adjusted each reporting period based on the relevant facts and conditions at the reporting date. Stock-based compensation expense related to the Earnout Shares is recorded within acquisition-related costs and expenses on the Consolidated Statements of Operations and Other Comprehensive Income. The Company recognized $412,000, $292,000, and $47,000 for the fiscal years ended September 30, 2017, 2016, and 2015, respectively.

INCOME TAXES

12 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

INCOME TAXES

Income (loss) before taxes for the fiscal years ended September 30, 2017, 2016, and 2015 is comprised of the following (amounts shown in thousands):



	2017			2016			2015
Domestic	$	4,057		$	2,732		$	1,994
Foreign	(886		)	(774		)	(11		)
Total	$	3,171		$	1,958		$	1,983

For the fiscal years ended September 30, 2017, 2016, and 2015 the income tax (provision) benefit was as follows (amounts shown in thousands):



	2017			2016			2015
Federal—current	$	(127	)	$	(129	)	$	(84	)
Federal—deferred	8,291			—			621
State—current	(20		)	(16		)	(10		)
State—deferred	2,748			—			13
Foreign—current	29			146			3
Total	$	10,921		$	1		$	543

Significant components of the Company’s net deferred tax assets and liabilities as of September 30, 2017 and 2016 are as follows (amounts shown in thousands):



	2017			2016
Deferred tax assets:
Stock based compensation	$	3,671		$	2,898
Net operating loss carryforwards	3,453			7,095
Research credit carryforwards	3,171			44
AMT credit carryforwards	392			279
Foreign net operating losses	386			327
Other, net	770			320
Total deferred assets	11,843			10,963
Deferred tax liabilities:
Intangibles	(393		)	(473		)
Foreign deferred liabilities	(280		)	(356		)
Net deferred tax asset	11,170			10,134
Valuation allowance for net deferred tax assets	(105		)	(10,163		)
Net deferred tax asset (liability)	$	11,065		$	(29	)

The net change in the total valuation allowance for the fiscal years ended September 30, 2017 and 2016 was a decrease of $10.1 million and $1.9 million, respectively. In assessing the realizability of deferred tax assets, the Company considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during periods in which those temporary differences become deductible. The Company considers projected future taxable income and planning strategies in making this assessment. Based on the level of historical operating results and the projections for future taxable income, the Company has determined that it is more likely than not that the deferred tax assets may be realized. Accordingly, the Company has removed the valuation allowance for all deferred tax assets with the exception of the net foreign deferred tax assets.

As of September 30, 2017, the Company has available net operating loss carryforwards of $29.4 million for federal income tax purposes, which will start to expire in 2032. The net operating losses for state purposes are $29.4 million and will begin to expire in 2028. Included in these amounts are federal and state net operating losses of $21.1 million attributable to stock option deductions of which the tax benefit will be credited to equity when realized. As of September 30, 2017, the Company has available federal research and development credit carryforwards, net of reserves, of $1.9 million and alternative minimum tax credit carryforwards of $0.4 million. The federal research and development credits will start to expire in 2027. As of September 30, 2017, the Company has available California research and development credit carryforwards, net of reserves, of $1.6 million, which do not expire.

Sections 382 and 383 of the Internal Revenue Code of 1986, as amended (the "IRC") limit the utilization of tax attribute carryforwards that arise prior to certain cumulative changes in a corporation’s ownership. The Company has completed an IRC Section 382/383 analysis through March 31, 2017 and any identified ownership changes had no impact to the utilization of tax attribute carryforwards. Any future ownership changes may have an impact on the utilization of the tax attribute carryforwards.

The difference between the income tax (provision) benefit and income taxes computed using the U.S. federal income tax rate was as follows for the fiscal years ended September 30, 2017, 2016, and 2015 (amounts shown in thousands):



	2017			2016			2015
Amount computed using statutory rate	$	(1,078	)	$	(666	)	$	(674	)
Net change in valuation allowance for net deferred tax assets	10,058			1,889			1,619
AMT and other	20			(148		)	151
Foreign rate differential	(169		)	(70		)	(1		)
Non-deductible items	(370		)	(1,136		)	(182		)
State income tax	(34		)	(15		)	(370		)
Foreign net operating loss	—			147			—
Research and development credits	$	2,494		$	—		$	—
Income tax (provision) benefit	$	10,921		$	1		$	543

On November 20, 2015, the FASB issued ASU No 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes, which requires all deferred tax assets and liabilities to be classified as noncurrent on the balance sheet. The new accounting guidance is effective for annual reporting periods beginning after December 15, 2016 and interim periods therein. The Company has adopted the standard prospectively as of September 30, 2017 and no adjustment was made to prior periods.

In accordance with authoritative guidance, the impact of an uncertain income tax position on the income tax return must be recognized at the largest amount that is more-likely-than-not to be sustained upon audit by the relevant taxing authority. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained.

The following table reconciles the beginning and ending amount of unrecognized tax benefits for the fiscal years ended September 30, 2017, 2016, and 2015 (amounts shown in thousands):



	2017		2016		2015
Gross unrecognized tax benefits at the beginning of the year	$	—	$	—	$	—
Additions from tax positions taken in the current year	140		—		—
Additions from tax positions taken in prior years	1,041		—		—
Reductions from tax positions taken in prior years	—		—		—
Tax settlements	—		—		—
Gross unrecognized tax benefits at end of the year	$	1,181	$	—	$	—

Of the total unrecognized tax benefits at September 30, 2017, $1.2 million will impact the Company's effective tax rate. The Company does not anticipate that there will be a substantial change in unrecognized tax benefits within the next 12 months.

The Company's practice is to recognize interest and/or penalties related to income tax matters in income tax expense. As of September 30, 2017, no accrued interest or penalties related to uncertain tax positions are recorded in the consolidated financial statements.

The Company is subject to income taxation in the U. S. at the Federal and state levels. All tax years are subject to examination by US, California, and other state tax authorities due to the carryforward of unutilized net operating losses and tax credits. We are also subject to foreign income taxes in the countries in which we operate. The Company is not currently under examination by any taxing authorities.

COMMITMENTS AND CONTINGENCIES

12 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Rothschild Mobile Imaging Innovations, Inc.

On May 16, 2014, Rothschild Mobile Imaging Innovations, Inc. (“RMII”) filed a complaint against us in the U.S. District Court for the District of Delaware (the "Court") alleging that certain of our mobile imaging products infringe four RMII-owned patents related to mobile imaging technology. On June 1, 2014, RMII amended its complaint to add JPMorgan Chase & Co. and JPMorgan Chase Bank, N.A. (together, “Chase”), one of our customers, as a defendant in the lawsuit (as amended, the “Initial Lawsuit”). On September 8, 2014, RMII filed three additional complaints (the “Subsequent Lawsuits”) against us in the Court. The Subsequent Lawsuits contain allegations substantially similar to the Initial Lawsuit regarding infringement by our mobile imaging products of the four RMII-owned patents related to mobile imaging technology, but name as co-defendants Citibank, N.A., Citigroup Inc., Wells Fargo & Company, Wells Fargo Bank, N.A., Bank of America Corporation and Bank of America, N.A., respectively (together with Chase, the “Bank Defendants”). RMII subsequently filed amended complaints (together with the Initial Lawsuit and the Subsequent Lawsuits, the “RMII Lawsuits”) adding as defendants both Fiserv and NCR (the “Distributor Defendants”), each of whom distributes our mobile imaging technology to one or more of the Bank Defendants. Based on our understanding of the claims, we agreed to accept the demands for indemnity and defense tendered by each of the Bank Defendants and Distributor Defendants in connection with the RMII Lawsuits.

On November 10, 2014, we filed a motion to sever and stay the claims against Chase in the Initial Lawsuit pending resolution of RMII’s claims against us, which motion was granted on August 3, 2015. On November 19, 2014, we filed joinders to the motion to stay with respect to the Subsequent Lawsuits, which joinders were also granted on August 3, 2015. Additionally, the Patent Trial and Appeal Board (“PTAB”) of the Patent and Trademark Office instituted our petitions for Inter Partes Review (“IPR”) challenging the patentability of all four asserted patents, and the Court agreed to stay the litigation in its entirety until all of the decisions are rendered in the IPR proceedings.

On July 20, 2016, the PTAB entered its final decision in the IPR proceedings. The PTAB ruled that all claims asserted in the litigation in all four RMII patents were directed to unpatentable subject matter and thus not patent eligible. On September 16, 2016, the parties filed a joint status report notifying the Court of the PTAB’s decisions in the IPRs. Through that notice, Mitek requested that the Court enter a judgment of non-infringement, or, in the alternative, dismiss all of RMII’s claims against all defendants with prejudice. On September 16, 2016, RMII filed a motion to dismiss without prejudice. Mitek and the Bank Defendants opposed the motion. On September 15, 2017, the Court granted the motion, but dismissed the cases with prejudice. On September 29, 2017, Mitek filed a motion for attorneys' fees and expenses. RMII recently filed a response to that motion.

Other Legal Matters

In addition to the foregoing, the Company is subject to various claims and legal proceedings arising in the ordinary course of its business. The Company accrues for such liabilities when it is both (i) probable that a loss has occurred and (ii) the amount of the loss can be reasonably estimated in accordance with ASC 450, Contingencies. While any legal proceeding has an element of uncertainty, the Company believes that the disposition of such matters, in the aggregate, will not have a material effect on the Company’s financial condition or results of operations.

Employee 401(k) Plan

The Company has a 401(k) plan that allows participating employees to contribute a percentage of their salary, subject to Internal Revenue Service annual limits. In 2015, the Company implemented a company match to the plan. The Company's contributions are made in an amount equal to 25% of the first 6% of an employee's designated deferral of their eligible compensation. The Company's total cost related to the 401(k) plan was $121,000, $91,000, and $42,000 for the fiscal years ended September 30, 2017, 2016, and 2015, respectively.

Facility Lease

The Company’s principal executive offices, as well as its research and development facility, are located in approximately 28,791 square feet of office space in San Diego, California. The term of the lease for the Company’s offices commenced on October 1, 2016 and continues through April 30, 2020. The annual base rent under this lease is approximately $0.6 million per year. In connection with this lease, the Company received tenant improvement allowances totaling $0.3 million. These lease incentives are being amortized as a reduction of rent expense over the term of the lease. The Company’s previous facility lease terminated on October 16, 2016 and the unamortized balance of the lease incentives associated with that lease were $49,000 at September 30, 2016. The offices of IDchecker are located in The Netherlands. The term of the lease for the office continues through May 31, 2020. The annual base rent under the lease is approximately €48,000 per year. The Company has a sales office in London, United Kingdom. The term of this lease continues through May 31, 2018. The annual base rent under this lease is approximately £77,000 per year.

Future annual minimum rental payments payable under the facility leases are as follows (shown in thousands):



Years ended September 30:
2018	$	917
2019	867
2020	498
2021	25
2022	12
Thereafter	—
Total	$	2,319

Rent expense for the Company’s operating leases for its facilities for the years ended September 30, 2017, 2016, and 2015 totaled $0.6 million, $0.3 million and $0.4 million, respectively.

REVENUE AND VENDOR CONCENTRATIONS	12 Months Ended
REVENUE AND VENDOR CONCENTRATIONS	Sep. 30, 2017
Risks and Uncertainties [Abstract]
REVENUE AND VENDOR CONCENTRATIONS	REVENUE AND VENDOR CONCENTRATIONS Revenue Concentration For the fiscal year ended September 30, 2017, the Company derived revenue of $10.4 million, or 23% of the Company’s total revenue, from one customer, compared to revenue of $6.3 million, or 18% of the Company’s total revenue, from one customer for the fiscal year ended September 30, 2016. For the fiscal year ended September 30, 2015, the Company derived revenue of $6.3 million or 25% of the Company’s total revenue, from one customer. The corresponding accounts receivable balances of customers from which revenues were in excess of 10% of total revenue were $1.3 million, $1.0 million and $1.1 million at September 30, 2017, 2016 and 2015, respectively. The Company’s revenue is derived primarily from the sale by the Company to channel partners, including systems integrators and resellers, and end-users of licenses to sell products covered by the Company’s patented technologies. In most cases, the channel partners purchase the license from the Company after they receive an order from an end-user. The channel partners receive orders from various individual end-users; therefore, the sale of a license to a channel partner may represent sales to multiple end-users. End-users can purchase the Company’s products through more than one channel partner. Revenues can fluctuate based on the timing of license renewals by channel partners. When a channel partner purchases or renews a license, the Company receives a license fee in consideration for the grant of a license to sell the Company’s products and there are no future payment obligations related to such agreement; therefore, the license fee the Company receives with respect to a particular license renewal in one period does not have a correlation with revenue in future periods. During the last few years, sales of licenses to one or more channel partners have comprised a significant part of the Company’s revenue. This is attributable to the timing of renewals or purchases of licenses and does not represent a dependence on any single channel partner. The Company believes that it is not dependent upon any single channel partner, even those from which revenues were in excess of 10% of the Company’s total revenue in a specific reporting period, and that the loss or termination of the Company’s relationship with any such channel partner would not have a material adverse effect on the Company’s future operations because either the Company or another channel partner could sell the Company’s products to the end-user that had purchased from the channel partner the Company lost. International sales accounted for approximately 14%, 15% and 5% of the Company’s total revenue for the fiscal years ended September 30, 2017, 2016, and 2015, respectively. Vendor Concentration The Company purchases its integrated software components from multiple third-party software providers at competitive prices. For the fiscal years ended September 30, 2017, 2016, and 2015, the Company did not make purchases from any one vendor comprising 10% or more of the Company’s total purchases. The Company has entered into contractual relationships with some of its vendors; however, the Company does not believe it is substantially dependent upon nor exposed to any significant concentration risk related to purchases from any of its vendors, given the availability of alternative sources for its necessary integrated software components.

QUARTERLY INFORMATION (UNAUDITED)

12 Months Ended

Sep. 30, 2017

Quarterly Financial Information Disclosure [Abstract]

QUARTERLY INFORMATION (UNAUDITED)

The following table sets forth selected quarterly financial data for 2017, 2016, and 2015 (shown in thousands except per share data):



	2017 (by quarter)
	1			2			3			4
Revenue	$	9,269		$	11,419		$	11,798		$	12,904
Cost of revenue	891			830			1,182			1,138
Operating expenses	9,050			9,365			10,132			10,033
Operating income (loss)	(672		)	1,224			484			1,733
Other income, net	65			67			149			121
Income tax benefit (provision)	—			(74		)	(17		)	11,012
Net income (loss)	(607		)	1,217			616			12,866
Net income (loss) per share:
Basic income (loss) per share	(0.02		)	0.04			0.02			0.38
Shares used in calculating net income (loss) per share - basic	32,377			32,786			33,024			33,522
Diluted income (loss) per share	(0.02		)	0.03			0.02			0.35
Shares used in calculating net income (loss) per share - diluted	32,377			34,815			35,610			36,251



	2016 (by quarter)
	1			2			3		4
Revenue	$	7,404		$	8,522		$	9,105	$	9,670
Cost of revenue	942			720			793		940
Operating expenses	6,804			7,171			7,618		7,889
Operating income (loss)	(342		)	631			694		841
Other income, net	36			30			45		23
Income tax benefit (provision)	(16		)	(79		)	—		96
Net income (loss)	(322		)	582			739		960
Net income (loss) per share:
Basic income (loss) per share	(0.01		)	0.02			0.02		0.03
Shares used in calculating net income (loss) per share - basic	31,094			31,326			31,823		32,086
Diluted income (loss) per share	(0.01		)	0.02			0.02		0.03
Shares used in calculating net income (loss) per share - diluted	31,094			33,134			34,532		34,860



	2015 (by quarter)
	1			2		3		4
Revenue	$	5,389		$	5,672	$	6,440	$	7,866
Cost of revenue	497			558		591		825
Operating expenses	4,758			4,628		5,539		6,079
Operating income	134			486		310		962
Other income, net	15			21		30		25
Income tax benefit (provision)	(3		)	—		578		(32		)
Net income	146			507		918		955
Net income per share:
Basic income per share	—			0.02		0.03		0.03
Shares used in calculating net income per share - basic	30,618			30,697		30,765		30,969
Diluted income per share	—			0.02		0.03		0.03
Shares used in calculating net income per share - diluted	31,174			31,321		31,646		31,664

SUBSEQUENT EVENT	12 Months Ended
SUBSEQUENT EVENT	Sep. 30, 2017
Subsequent Events [Abstract]
SUBSEQUENT EVENT	SUBSEQUENT EVENT Acquisition of ICAR Vision Systems, S.L. On October 16, 2017, Mitek Holding B.V., a company incorporated under the laws of The Netherlands and a wholly owned subsidiary of the Company (“Mitek Holding B.V.”), acquired all of the issued and outstanding shares of ICAR Vision Systems, S.L. (“ICAR”), a company incorporated under the laws of Spain (the “ICAR Acquisition”) and each of its subsidiaries, pursuant to a Share Purchase Agreement (the “ICAR Purchase Agreement”), by and among, the Company, Mitek Holding B.V., and each of the shareholders of ICAR (the “ICAR Sellers”). Upon completion of the ICAR Acquisition, ICAR became a direct wholly owned subsidiary of Mitek Holding B.V. and an indirect wholly owned subsidiary of the Company. Under the terms of the ICAR Purchase Agreement, Mitek Holding B.V. agreed to purchase all of the outstanding shares of ICAR for an aggregate purchase price of up to $15 million. On closing, $4.1 million was paid in cash and $5.6 million in shares of the Company’s common stock, or 584,291 shares, were issued to the ICAR Sellers. The ICAR Purchase Agreement also provides for additional payments of up to approximately $5.3 million upon the achievement of certain financial milestones during fiscal 2018 and fiscal 2019.

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations Mitek Systems, Inc. ("Mitek" or the "Company") is a leading innovator of mobile identity verification solutions. Mitek is a software development company with expertise in artificial intelligence and machine learning. As of September 30, 2017, over 5,900 financial services organizations have signed agreements to deploy Mobile Deposit®. These include all of the top ten, and nearly all of the top 50 U.S. retail banks. The Company's solutions are embedded in native mobile apps and mobile optimized websites to facilitate better mobile user experiences and compliant transactions. Mitek's Mobile Deposit® solution is used today by millions of consumers in the U.S. and Canada for mobile check deposit. Following the success of Mobile Deposit®, Mitek introduced a multi-check capture solution that enables businesses to deposit multiple checks in one batch using a mobile device. As of September 30, 2017, the Company has been granted 35 patents and it has an additional 16 patent applications pending. Mitek is also applying its artificial intelligence and machine learning science to digital identity verification globally. Mitek’s Mobile Verify™ is empowering the digital transformation of companies by enabling them to identify with whom they are conducting business. To be in compliance with many governmental Know Your Customer and Anti-Money Laundering regulatory requirements around the globe identity verification is mandatory. In addition to regulated markets, digital identity verification is also becoming an imperative in the new trust based sharing economy. The Company's identity verification solutions are for use with digital/mobile onboarding, trust establishment, and to facilitate money movement. Today, the financial services verticals (banks, credit unions, lenders, payments processors, card issuers, insurers, etc.) represent the most usage of our solutions, but we are also seeing growing adoption by telecommunications, healthcare, travel, retail, sharing economy, and online marketplaces. The Company markets and sells its products and services worldwide through internal, direct sales teams located in the US and Europe, as well as through channel partners. The partner sales strategy includes channel partners who are financial services technology providers and identity verification providers. These partners integrate our products into their solutions to meet the needs of their customers.
Basis of Presentation	Basis of Presentation The financial statements are prepared under the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 105-10, Generally Accepted Accounting Principles, in accordance with accounting principles generally accepted in the U.S. (“GAAP”).
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Foreign Currency	Foreign Currency The Company has foreign subsidiaries that operate and sell products and services in various countries and jurisdictions around the world. As a result, the Company is exposed to foreign currency exchange risks. For those subsidiaries whose functional currency is not the U.S. dollar, assets and liabilities are translated into U.S. dollars equivalents at the exchange rate in effect on the balance sheet date and revenues and expenses are translated into U.S. dollars using the average exchange rate over the period. Resulting currency translation adjustments are recorded in accumulated other comprehensive income in the consolidated balance sheet.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, expenses, deferred taxes, and related disclosure of contingent assets and liabilities. On an ongoing basis, management reviews its estimates based upon currently available information. Actual results could differ materially from those estimates. These estimates include, but are not limited to, assessing the collectability of accounts receivable, estimation of the value of stock-based compensation awards, fair value of assets and liabilities acquired, impairment of goodwill, useful lives of intangible assets, vendor specific objective evidence (“VSOE”) of fair value related to revenue recognition, and income taxes.
Goodwill and Purchased Intangible Assets	Goodwill and Purchased Intangible Assets The Company’s goodwill resulted from the acquisition of IDchecker in fiscal year 2015. Goodwill and intangible assets with indefinite useful lives are not amortized, but are tested for impairment at least annually or as circumstances indicate that their value may no longer be recoverable. In accordance with ASC Topic 350, Intangibles—Goodwill and Other (“ASC Topic 350”), the Company reviews its goodwill and indefinite-lived intangible asset for impairment at least annually in its fiscal fourth quarter and more frequently if events or changes in circumstances occur that indicate a potential reduction in the fair value of its reporting unit and/or its indefinite-lived intangible asset below their respective carrying values. Examples of such events or circumstances include: a significant adverse change in legal factors or in the business climate, a significant decline in the Company’s stock price, a significant decline in the Company’s projected revenue or cash flows, an adverse action or assessment by a regulator, unanticipated competition, a loss of key personnel, or the presence of other indicators that would indicate a reduction in the fair value of a reporting unit. The Company’s goodwill is considered to be impaired if management determines that the carrying value of the reporting unit to which the goodwill has been assigned exceeds management’s estimate of its fair value. Based on the guidance provided by ASC Topic 350 and ASC Topic 280, Segment Reporting (“ASC Topic 280”), management has determined that the Company operates in one segment and consists of one reporting unit given the similarities in economic characteristics between its operations and the common nature of its products, services and customers. Because the Company has only one reporting unit, and because the Company is publicly traded, the Company determines the fair value of the reporting unit based on its market capitalization as it believe this represents the best evidence of fair value. In the fourth quarter of fiscal 2017, management completed its annual goodwill impairment test and concluded that the Company’s goodwill was not impaired. The Company’s conclusion that goodwill was not impaired was based on a comparison of its net assets to its market capitalization. Because the Company determines the fair value of its reporting unit based on its market capitalization, the Company’s future reviews of goodwill for impairment may be impacted by changes in the price of its common stock. For example, a significant decline in the price of the Company’s common stock may cause the fair value of its goodwill to fall below its carrying value. Therefore, the Company cannot assure you that when it completes its future reviews of goodwill for impairment a material impairment charge will not be recorded.
Net Income Per Share	Net Income Per Share The Company calculates net income per share in accordance with FASB ASC Topic 260, Earnings per Share. Basic net income per share is based on the weighted average number of common shares outstanding during the period. Diluted net income per share also gives effect to all potentially dilutive securities outstanding during the period, such as options, warrants, and restricted stock units (“RSUs”), if dilutive. In a period with a net loss position, potentially dilutive securities are not included in the computation of diluted net loss because to do so would be antidilutive, and the number of shares used to calculate basic and diluted net loss is the same.
Revenue Recognition	Revenue Recognition Revenue from sales of software licenses sold through direct and indirect channels is recognized upon shipment of the related product, if the requirements of FASB ASC Topic 985-605, Software Revenue Recognition (“ASC 985-605”) are met, including evidence of an arrangement, delivery, fixed or determinable fee, collectability, and VSOE of the fair value of the undelivered element. If the requirements of ASC 985-605 are not met at the date of shipment, revenue is not recognized until such elements are known or resolved. Revenue from customer support services, or maintenance revenue, includes post-contract support and the rights to unspecified upgrades and enhancements. VSOE of fair value for customer support services is determined by reference to the price the customer pays for such element when sold separately; that is, the renewal rate offered to customers. In those instances when objective and reliable evidence of fair value exists for the undelivered items but not for the delivered items, the residual method is used to allocate the arrangement consideration. Under the residual method, the amount of arrangement consideration allocated to the delivered items equals the total arrangement consideration less the aggregate fair value of the undelivered items. Revenue from post-contract customer support is recognized ratably over the term of the contract. Certain customers have agreements that provide for usage fees above fixed minimums. Usage fees above fixed minimums are recognized as revenue when such amounts are reasonably estimable and billable. Revenue from professional services is recognized when such services are delivered. When a software sales arrangement requires professional services related to significant production, modification, or customization of software, or when a customer considers professional services essential to the functionality of the software product, revenue is recognized based on predetermined milestone objectives required to complete the project, as those milestone objectives are deemed to be substantive in relation to the work performed. Any expected losses on contracts in progress are recorded in the period in which the losses become probable and reasonably estimable. The Company provides hosting services that give customers access to software that resides on its servers. The Company’s model typically includes an up-front fee and a monthly commitment from the customer that commences upon completion of the implementation through the remainder of the customer life. The up-front fee is the initial setup fee, or the implementation fee. The monthly commitment includes, but is not limited to, a fixed monthly fee or a transactional fee based on system usage that exceeds monthly minimums. The Company does not view the signing of the contract or the provision of initial setup services as discrete earnings events that have stand-alone value. Revenue is typically deferred until the date the customer commences use of services, at which point the up-front fees are recognized ratably over the life of the customer arrangement.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents are defined as highly liquid financial instruments with original maturities of three months or less. A substantial portion of the Company’s cash is deposited with one financial institution. The Company monitors the financial condition of this financial institution and does not believe that funds on deposit are subject to a significant degree of risk.
Investments	Investments Investments consist of corporate notes and bonds, commercial paper, and U.S. Treasury securities. The Company classifies investments as available-for-sale at the time of purchase and reevaluates such classification as of each balance sheet date. All investments are recorded at estimated fair value. Unrealized gains and losses for available-for-sale securities are included in accumulated other comprehensive income, a component of stockholders’ equity. The Company evaluates its investments to assess whether those with unrealized loss positions are other-than-temporarily impaired. Impairments are considered to be other-than-temporary if they are related to deterioration in credit risk or if it is likely that the Company will sell the securities before the recovery of its cost basis. Realized gains and losses and declines in value judged to be other-than-temporary are determined based on the specific identification method and are reported in other income (expense), net in the statements of other comprehensive income. No other-than-temporary impairment charges were recognized in the fiscal years ended September 30, 2017, 2016 and 2015. All investments whose maturity or sale is expected within one year are classified as “current” on the Consolidated Balance Sheet. All other securities are classified as “long-term” on the Consolidated Balance Sheet.
Fair Value Measurements	Fair Value Measurements The carrying amounts of cash equivalents, investments, accounts receivable, accounts payable, and other accrued liabilities are considered representative of their respective fair values because of the short-term nature of those instruments.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts Trade accounts receivable are recorded at the net invoice value and are not interest bearing. The Company considers receivables past due based on the contractual payment terms. Allowances for doubtful accounts are established based on various factors including credit profiles of the Company’s customers, contractual terms and conditions, historical payments, and current economic trends. The Company reviews its allowances by assessing individual accounts receivable over a specific aging and amount. Accounts receivable are written off on a case-by-case basis, net of any amounts that may be collected.
Deferred Maintenance Fees	Deferred Maintenance Fees Deferred maintenance fees consist of capitalized costs associated with software maintenance fees paid to vendors who supply licenses and maintenance for software embedded in the Company’s products that it sells to customers. These software maintenance fees, which are included in other current assets on the balance sheet, are typically billed annually to the Company and are amortized to cost of revenue-maintenance and professional services in the Consolidated Statements of Operations and Other Comprehensive Income over the maintenance period, which is typically one year.
Property and Equipment	Property and Equipment Property and equipment are carried at cost.
Long-Lived Assets	Long-Lived Assets The Company evaluates the carrying value of long-lived assets, including license agreements and other intangible assets, when events and circumstances indicate that these assets may be impaired or in order to determine whether any revision to the related amortization periods should be made. This evaluation is based on management’s projections of the undiscounted future cash flows associated with each product or asset. If management’s evaluation indicates that the carrying values of these intangible assets were impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets.
Capitalized Software Development Costs	Capitalized Software Development Costs Costs incurred for the development of software that will be sold, leased, or otherwise marketed are capitalized when technological feasibility has been established. Software development costs consist primarily of compensation of development personnel and related overhead incurred to develop new products and upgrade and enhance the Company’s current products, as well as fees paid to outside consultants. Capitalization of software development costs ceases and amortization of capitalized software development costs commences when the products are available for general release. For the fiscal years ended September 30, 2017 and 2016, no software development costs were capitalized because the time period and cost incurred between technological feasibility and general release for all software product releases were not material. We had no amortization expense from capitalized software costs during the years ended September 30, 2017, 2016, or 2015. Costs related to software acquired, developed, or modified solely to meet our internal requirements, with no substantive plans to market such software at the time of development, are capitalized. Costs incurred during the preliminary planning and evaluation stage of the project and during post implementation operational stage are expensed as incurred. Costs incurred during the application development stage of the project are capitalized. The Company defines the design, configuration, and coding process as the application development stage.
Deferred Revenue	Deferred Revenue Deferred revenues represent advance payments or billings for software licenses, professional services, and maintenance billed in advance of the time we recognize the related revenues. Deferred maintenance revenue represents customer billings, paid up front, generally annually at the beginning of each maintenance period, with revenue recognized ratably over such period. For certain other licensing arrangements, revenue attributable to undelivered elements, including post-contract customer support which typically includes telephone support and the right to receive unspecified upgrades and enhancements of software on a when-and-if-available basis, is based upon the sales price of those elements when sold separately and is recognized ratably on a straight-line basis over the term of the arrangement.
Guarantees	Guarantees In the ordinary course of business, the Company is not subject to potential obligations under guarantees that fall within the scope of FASB ASC Topic 460, Guarantees (“ASC 460”), except for standard indemnification and warranty provisions that are contained within many of the Company’s customer license and service agreements and certain supplier agreements, and give rise only to the disclosure requirements prescribed by ASC 460. Indemnification and warranty provisions contained within the Company’s customer license and service agreements and certain supplier agreements are generally consistent with those prevalent in the Company’s industry. The Company has not historically incurred significant obligations under customer indemnification or warranty provisions and does not expect to incur significant obligations in the future. Accordingly, the Company does not maintain accruals for potential customer indemnification or warranty-related obligations.
Loss Contingencies	Loss Contingencies The Company records its best estimates of a loss contingency when it is considered probable and the amount can be reasonably estimated. When a range of loss can be reasonably estimated with no best estimate in the range, the Company records the minimum estimated liability related to the claim. As additional information becomes available, the Company assesses the potential liability related to the Company’s pending loss contingency and revises its estimates. The Company discloses contingencies if there is at least a reasonable possibility that a material loss or a material additional loss may have been incurred. The Company’s legal costs are expensed as incurred.
Income Taxes	Income Taxes The Company accounts for income taxes in accordance with FASB ASC Topic 740, Income Taxes (“ASC 740”). Deferred tax assets and liabilities arise from temporary differences between the tax bases of assets and liabilities and their reported amounts in the financial statements that will result in taxable or deductible amounts in future years. Management evaluates the available evidence about future taxable income and other possible sources of realization of deferred tax assets. The valuation allowance reduces deferred tax assets to an amount that represents management’s best estimate of the amount of such deferred tax assets that more likely than not will be realized. See Note 6 for additional details. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the tax authorities, based on the technical merits of the position. The tax benefit is measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. The Company recognizes interest and penalties related to income tax matters in income tax expense. See Note 6 for additional details.
Stock-Based Compensation	Stock-Based Compensation The Company records stock-based compensation in accordance with FASB ASC Topic 718, Compensation-Stock Compensation (“ASC 718”). The Company estimates the fair value of stock options using the Black-Scholes option pricing model. The fair value of stock options granted is recognized as an expense over the requisite service period. Stock-based compensation expense for all share-based payment awards is recognized using the straight-line single-option method. The Black-Scholes option pricing model requires subjective assumptions, including future stock price volatility and expected time to exercise, which greatly affect the calculated values. The expected term of options granted is derived from historical data on employee exercises and post-vesting employment termination behavior. The risk-free rate selected to value any particular grant is based on the U.S. Treasury rate that corresponds to the expected life of the grant effective as of the date of the grant. The expected volatility is based on the historical volatility of the Company’s stock price. These factors could change in the future, affecting the determination of stock-based compensation expense in future periods.
Advertising Expense	Advertising Expense Advertising costs are expensed as incurred
Research and Development	Research and Development Research and development costs are expensed in the period incurred.
Leases	Leases Leases are reviewed and classified as capital or operating at their inception. For leases that contain rent escalations, the Company records the total rent payable on a straight-line basis over the term of the lease. The difference between rent payments and straight-line rent expense is recorded as deferred rent.
Segment Reporting	Segment Reporting FASB ASC Topic 280, Segment Reporting, requires the use of a management approach in identifying segments of an enterprise. During the fiscal year ended September 30, 2017, management determined that the Company has only one operating segment: the development, sale and service of proprietary software solutions related to mobile imaging.
Comprehensive Income	Comprehensive Income Comprehensive income consists of net income and unrealized gains and losses on available-for-sale securities and foreign currency translation adjustments.
Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements In September 2015, the FASB issued Accounting Standards Update (“ASU”) No. 2015-16, Simplifying the Accounting for Measurement-Period Adjustments (Topic 805) (“ASU 2015-16”) which eliminates the requirement to restate prior period financial statements for measurement period adjustments. ASU 2015-16 requires that the cumulative impact of a measurement period adjustment (including the impact on prior periods) be recognized in the reporting period in which the adjustment is identified. The new standard is effective for interim and annual periods beginning after December 15, 2015 and early adoption is permitted. The Company adopted the standard prospectively as of October 1, 2016. The adoption of ASU 2015-16 did not have a material impact on the results of operations, financial condition, or cash flows of the Company. Recently Issued Accounting Pronouncements In May 2017, the FASB issued ASU No. 2017-09, Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting ("ASU 2017-09"), which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. ASU 2017-09 requires entities to account for the effects of a modification unless the fair value, vesting conditions, and classification of the modified award are all the same as the original award immediately before the original award is modified. ASU 2017-09 is effective for interim and annual reporting periods beginning after December 15, 2017 with early adoption permitted. The Company does not expect the adoption of ASU 2017-09 to have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”), which eliminates Step 2 of the goodwill impairment test that had required a hypothetical purchase price allocation. Rather, entities should apply the same impairment assessment to all reporting units and recognize an impairment loss for the amount by which a reporting unit's carrying amount exceeds its fair value, without exceeding the total amount of goodwill allocated to that reporting unit. Entities will continue to have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 will be effective prospectively for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019, or those beginning after January 1, 2017 if adopted early. The Company does not expect the adoption of ASU 2017-04 to have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (“ASU 2017-01”), which clarifies the definition of a business with the objective of adding guidance and providing a more robust framework to assist reporting organizations with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. For public entities, ASU 2017-01 is effective prospectively for fiscal years, including interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted for transactions occurring before the issuance or effective date of the standard for which financial statements have not yet been issued. The Company does not expect the adoption of ASU 2017-01 to have a material impact on its consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (Topic 740) (“ASU 2016-16”), which requires entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. ASU 2016-16 is effective for interim and annual reporting periods beginning after December 15, 2017 with early adoption permitted. The Company is currently evaluating the impact ASU 2016-16 will have on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), which requires entities to use a Current Expected Credit Loss model which is a new impairment model based on expected losses rather than incurred losses. Under this model, an entity would recognize an impairment allowance equal to its current estimate of all contractual cash flows that the entity does not expect to collect from financial assets measured at amortized cost. The entity's estimate would consider relevant information about past events, current conditions and reasonable and supportable forecasts. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 31, 2019 with early adoption permitted for annual reporting periods beginning after December 31, 2018. The Company is currently evaluating the impact ASU 2016-13 will have on its consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation – Stock Compensation (Topic 718) (“ASU 2016-09”), which simplified certain aspects of the accounting for share-based payment transactions, including income taxes, classification of awards and classification in the statement of cash flows. ASU 2016-09 will be effective for the Company beginning in its first quarter of fiscal 2018. The Company does not expect the adoption of ASU 2016-09 to have a material impact on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which modified lease accounting for both lessees and lessors to increase transparency and comparability by recognizing lease assets and lease liabilities by lessees for those leases classified as operating leases under previous accounting standards and disclosing key information about leasing arrangements. ASU 2016-02 will be effective for the Company beginning in its first quarter of fiscal 2020 and early adoption is permitted. The Company is currently evaluating the timing of its adoption and the impact of adopting the new lease standard on its consolidated financial statements. In May 2014, the FASB issued guidance codified in FASB ASC Topic 606, Revenue Recognition – Revenue from Contracts with Customers, which amends the guidance in former ASC 605, Revenue Recognition. The Company has performed a review of the requirements of the new revenue standard and related ASUs and is monitoring the activity of the FASB and the transition resource group as it relates to specific interpretive guidance. The Company is reviewing customer contracts and is in the process of applying the new revenue standard to its key identified revenue streams included within either software revenue or SaaS, maintenance, and consulting revenue and is comparing the results to its current accounting practices. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2019. Entities have the option of adopting this new guidance using either a full retrospective or a modified approach with the cumulative effect of applying the guidance recognized at the date of initial application. The Company is currently evaluating the transition method to elect as well as necessary control and process changes due to implementing the new revenue standard. No other new accounting pronouncement issued or effective during the year ended September 30, 2017 had, or is expected to have, a material impact on the Company’s consolidated financial statements.

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Potentially Dilutive Common Shares Excluded from Net Income (Loss) per Share Calculation



	2017	2016	2015
Stock options	569	1,259	2,203
Restricted stock units	83	624	287
IDchecker closing shares	—	349	63
IDchecker earnout shares	24	—	—
Total potentially dilutive common shares outstanding	676	2,232	2,553

Computation of Basic and Diluted Net Income (Loss) Per Share

The computation of basic and diluted net income per share for the fiscal years ended September 30, 2017, 2016, and 2015 is as follows (amounts in thousands, except per share data):



	2017		2016		2015
Net income	$	14,092	$	1,959	$	2,526
Weighted-average common shares and share equivalents outstanding—basic	33,083		31,587		30,790
Dilutive potential common stock equivalents	2,454		2,232		690
Weighted-average common shares and share equivalents outstanding—diluted	35,537		33,819		31,480
Net income per share:
Basic	$	0.43	$	0.06	$	0.08
Diluted	$	0.40	$	0.06	$	0.08

Summary of Property and Equipment

The following is a summary of property and equipment as of September 30, 2017 and 2016 (amounts shown in thousands):



	2017			2016
Property and equipment—at cost:
Equipment	$	1,801		$	1,492
Furniture and fixtures	257			248
Leasehold improvements	1,128			1,021
	3,186			2,761
Less: accumulated depreciation and amortization	(2,573		)	(2,321		)
Total property and equipment, net	$	613		$	440

Components of Comprehensive Loss

The following table summarizes the components of comprehensive loss for the fiscal years ended September 30, 2017, 2016, and 2015 (amounts shown in thousands):



	2017			2016			2015
Net income	$	14,092		$	1,959		$	2,526
Other comprehensive income:
Foreign currency translation adjustment	208			(46		)	—
Change in unrealized gains (losses) on marketable securities	(19		)	7			5
Total comprehensive income	$	14,281		$	1,920		$	2,531

BUSINESS COMBINATION (Tables)

12 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Schedule of Estimated Fair Values of Assets acquired and Liabilities Assumed

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as part of the IDC Acquisition as of June 17, 2015 (amounts shown in thousands):



	June 17, 2015
Current assets	$	620
Property, plant and equipment	42
Intangible assets	3,570
Assets acquired	$	4,232
Current liabilities	$	(476	)
Other liabilities	(810		)
Liabilities assumed	$	(1,286	)
Fair value of net assets acquired	$	2,946
Total consideration paid	5,819
Goodwill before effect in exchange rates as of June 17, 2015	$	2,873
Effect of movements in exchange rates as of September 30, 2017	141
Goodwill as of September 30, 2017	$	3,014

INVESTMENTS (Tables)

12 Months Ended

Sep. 30, 2017

Gain (Loss) on Investments [Line Items]

Summary of Investments by Type of Security

The following tables summarize investments by security type as of September 30, 2017 and 2016 (amounts shown in thousands):



	September 30, 2017
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
US Treasury	$	3,897	$	—	$	(3	)	$	3,894
Corporate debt securities, short-term	26,393		—		(8		)	26,385
Corporate debt securities, long-term	3,785		—		(5		)	3,780
Total	$	34,075	$	—	$	(16	)	$	34,059



	September 30, 2016
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
U.S. Treasury, short-term	$	12,907	$	8	$	—		$	12,915
Corporate debt securities, short-term	11,949		2		(3		)	11,948
Corporate debt securities, long-term	1,954		1		(3		)	1,952
Total	$	26,810	$	11	$	(6	)	$	26,815

Summary of Fair Value of Investments Measured on Recurring Basis

The following tables represent the fair value hierarchy of the Company’s investments and acquisition-related contingent consideration as of September 30, 2017 and 2016 (amounts shown in thousands):



	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2017:
Assets:
Short-term investments:
U.S. Treasury	$	3,894	$	3,894	$	—	$	—
Corporate debt securities
Financial	3,041		—		3,041		—
Industrial	9,503		—		9,503		—
Commercial paper
Financial	10,850		—		10,850		—
Industrial	2,991		—		2,991		—
Total short-term investments at fair value	30,279		3,894		26,385		—
Long-term investments:
U.S. Treasury	—		—		—		—
Corporate debt securities
Financial	1,858		—		1,858		—
Industrial	1,922		—		1,922		—
Total assets at fair value	$	34,059	$	3,894	$	30,165	$	—
Liabilities:
Acquisition-related contingent consideration	354		—		—		354
Total liabilities at fair value	$	354	$	—	$	—	$	354



	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2016:
Assets:
Short-term investments:
U.S. Treasury	$	12,915	$	12,915	$	—	$	—
Corporate debt securities
Financial	3,963		—		3,963		—
Industrial	4,445		—		4,445		—
Commercial paper
Financial	2,843		—		2,843		—
Industrial	697		—		697		—
Total short-term investments at fair value	24,863		12,915		11,948		—
Long-term investments:
Corporate debt securities
Financial	502		—		502		—
Industrial	1,450		—		1,450		—
Total assets at fair value	$	26,815	$	12,915	$	13,900	$	—
Liabilities:
Acquisition-related contingent consideration	252		—		—		252
Total liabilities at fair value	$	252	$	—	$	—	$	252

Contingent Consideration

Gain (Loss) on Investments [Line Items]

Summary of Acquisition-related Contingent Consideration Measured at Fair Value



Balance at September 30, 2016	$	252
Expenses recorded due to changes in fair value	412
Issuance of common stock	(310		)
Balance at September 30, 2017	$	354

GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

Intangible assets as of September 30, 2017 are summarized as follows (amounts shown in thousands, except for years):



	Weighted Average Amortization Period	Cost		Accumulated Amortization		Net
Completed technologies	6 years	$	2,370	$	833	$	1,537
Customer relationships	6 years	970		341		629
Trade names	5 years	230		99		131
Total intangible assets		$	3,570	$	1,273	$	2,297

Schedule of Estimated Future Amortization Expense

The estimated future amortization expense related to intangible assets for each of the five succeeding fiscal years is expected to be as follows (amounts shown in thousands):



	Estimated Future Amortization Expense
2018	$	632
2019	632
2020	618
2021	415
2022	—
	$	2,297

STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Sep. 30, 2017

Equity [Abstract]

Fair Value Calculations for Stock-Based Compensation Awards

The fair value calculations for stock-based compensation awards to employees for the fiscal years ended September 30, 2017, 2016, and 2015 were based on the following assumptions:



	2017	2016	2015
Risk-free interest rate	1.68% – 1.92%	1.43% – 1.66%	1.29% – 1.66%
Expected life (years)	5.25	5.90	5.30
Expected volatility	74%	83%	90%
Expected dividends	None	None	None

Stock-Based Compensation Expense Related to Stock Options and RSUs



	2017		2016		2015
Cost of revenue	$	52	$	39	$	30
Sales and marketing	1,577		1,099		713
Research and development	1,028		660		592
General and administrative	2,821		2,281		2,032
Stock-based compensation expense related to employee stock options included in expenses	$	5,478	$	4,079	$	3,367

Stock Option Activity

The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2017, 2016, and 2015:



	Number of Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (in Years)
Outstanding, September 30, 2014	2,334,326		$	4.11	5.5
Granted	1,927,500		$	2.92
Exercised	(232,203	)	$	1.06
Cancelled	(381,918	)	$	3.85
Outstanding, September 30, 2015	3,647,705		$	3.70	7.2
Granted	98,500		$	4.51
Exercised	(661,663	)	$	2.67
Cancelled	(69,168	)	$	4.51
Outstanding, September 30, 2016	3,015,374		$	3.95	6.4
Granted	147,800		$	7.06
Exercised	(235,514	)	$	2.92
Cancelled	(81,794	)	$	3.59
Outstanding, September 30, 2017	2,845,866		$	4.21	5.4

RSU Activity

The following table summarizes RSU activity in the fiscal years ended September 30, 2017, 2016, and 2015:



	Number of shares		Weighted- average fair value per share
Outstanding at September 30, 2014	1,101,303		$	4.71
Granted	104,000		$	2.29
Settled	(255,041	)	$	2.96
Cancelled	(147,345	)	$	3.54
Outstanding at September 30, 2015	802,917		$	4.49
Granted	1,536,000		$	4.82
Settled	(261,621	)	$	4.77
Cancelled	(31,127	)	$	4.19
Outstanding at September 30, 2016	2,046,169		$	4.90
Granted	1,249,224		$	6.61
Settled	(707,174	)	$	4.81
Cancelled	(231,198	)	$	4.93
Outstanding at September 30, 2017	2,357,021		$	5.65

INCOME TAXES (Tables)

12 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Tax (Provision) Benefit

Income (loss) before taxes for the fiscal years ended September 30, 2017, 2016, and 2015 is comprised of the following (amounts shown in thousands):



	2017			2016			2015
Domestic	$	4,057		$	2,732		$	1,994
Foreign	(886		)	(774		)	(11		)
Total	$	3,171		$	1,958		$	1,983

For the fiscal years ended September 30, 2017, 2016, and 2015 the income tax (provision) benefit was as follows (amounts shown in thousands):



	2017			2016			2015
Federal—current	$	(127	)	$	(129	)	$	(84	)
Federal—deferred	8,291			—			621
State—current	(20		)	(16		)	(10		)
State—deferred	2,748			—			13
Foreign—current	29			146			3
Total	$	10,921		$	1		$	543

Company's Net Deferred Tax Assets and Liabilities

Significant components of the Company’s net deferred tax assets and liabilities as of September 30, 2017 and 2016 are as follows (amounts shown in thousands):



	2017			2016
Deferred tax assets:
Stock based compensation	$	3,671		$	2,898
Net operating loss carryforwards	3,453			7,095
Research credit carryforwards	3,171			44
AMT credit carryforwards	392			279
Foreign net operating losses	386			327
Other, net	770			320
Total deferred assets	11,843			10,963
Deferred tax liabilities:
Intangibles	(393		)	(473		)
Foreign deferred liabilities	(280		)	(356		)
Net deferred tax asset	11,170			10,134
Valuation allowance for net deferred tax assets	(105		)	(10,163		)
Net deferred tax asset (liability)	$	11,065		$	(29	)

Income Taxes Computed Using Federal Income Tax Rate



	2017			2016			2015
Amount computed using statutory rate	$	(1,078	)	$	(666	)	$	(674	)
Net change in valuation allowance for net deferred tax assets	10,058			1,889			1,619
AMT and other	20			(148		)	151
Foreign rate differential	(169		)	(70		)	(1		)
Non-deductible items	(370		)	(1,136		)	(182		)
State income tax	(34		)	(15		)	(370		)
Foreign net operating loss	—			147			—
Research and development credits	$	2,494		$	—		$	—
Income tax (provision) benefit	$	10,921		$	1		$	543

Schedule of Unrecognized Tax Benefits Roll Forward

The following table reconciles the beginning and ending amount of unrecognized tax benefits for the fiscal years ended September 30, 2017, 2016, and 2015 (amounts shown in thousands):



	2017		2016		2015
Gross unrecognized tax benefits at the beginning of the year	$	—	$	—	$	—
Additions from tax positions taken in the current year	140		—		—
Additions from tax positions taken in prior years	1,041		—		—
Reductions from tax positions taken in prior years	—		—		—
Tax settlements	—		—		—
Gross unrecognized tax benefits at end of the year	$	1,181	$	—	$	—

QUARTERLY INFORMATION (UNAUDITED) (Tables)

12 Months Ended

Sep. 30, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Data

The following table sets forth selected quarterly financial data for 2017, 2016, and 2015 (shown in thousands except per share data):



	2017 (by quarter)
	1			2			3			4
Revenue	$	9,269		$	11,419		$	11,798		$	12,904
Cost of revenue	891			830			1,182			1,138
Operating expenses	9,050			9,365			10,132			10,033
Operating income (loss)	(672		)	1,224			484			1,733
Other income, net	65			67			149			121
Income tax benefit (provision)	—			(74		)	(17		)	11,012
Net income (loss)	(607		)	1,217			616			12,866
Net income (loss) per share:
Basic income (loss) per share	(0.02		)	0.04			0.02			0.38
Shares used in calculating net income (loss) per share - basic	32,377			32,786			33,024			33,522
Diluted income (loss) per share	(0.02		)	0.03			0.02			0.35
Shares used in calculating net income (loss) per share - diluted	32,377			34,815			35,610			36,251



	2016 (by quarter)
	1			2			3		4
Revenue	$	7,404		$	8,522		$	9,105	$	9,670
Cost of revenue	942			720			793		940
Operating expenses	6,804			7,171			7,618		7,889
Operating income (loss)	(342		)	631			694		841
Other income, net	36			30			45		23
Income tax benefit (provision)	(16		)	(79		)	—		96
Net income (loss)	(322		)	582			739		960
Net income (loss) per share:
Basic income (loss) per share	(0.01		)	0.02			0.02		0.03
Shares used in calculating net income (loss) per share - basic	31,094			31,326			31,823		32,086
Diluted income (loss) per share	(0.01		)	0.02			0.02		0.03
Shares used in calculating net income (loss) per share - diluted	31,094			33,134			34,532		34,860



	2015 (by quarter)
	1			2		3		4
Revenue	$	5,389		$	5,672	$	6,440	$	7,866
Cost of revenue	497			558		591		825
Operating expenses	4,758			4,628		5,539		6,079
Operating income	134			486		310		962
Other income, net	15			21		30		25
Income tax benefit (provision)	(3		)	—		578		(32		)
Net income	146			507		918		955
Net income per share:
Basic income per share	—			0.02		0.03		0.03
Shares used in calculating net income per share - basic	30,618			30,697		30,765		30,969
Diluted income per share	—			0.02		0.03		0.03
Shares used in calculating net income per share - diluted	31,174			31,321		31,646		31,664

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Detail)	12 Months Ended
	Sep. 30, 2017 USD ($) patent segment institution	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Accounting Policies [Abstract]
Number of financial institutions signed agreements to deploy mobile deposit \| institution	5,900
Number of top U.S. retail banks that deployed mobile deposit \| institution	50
Number of patents granted \| patent	35
Number of patent applications pending \| patent	16
Currency translation adjustment	$ 208,000	$ (46,000)	$ 0
Number of operating segments \| segment	1
Number of reporting units \| segment	1
Impairment of goodwill and intangibles	$ 0
Other-than-temporary impairment charges recognized	0	0	0
Allowance for doubtful accounts	0	0	0
Allowance for doubtful accounts receivable	$ 31,000	35,000
Deferred software maintenance fees amortization period	1 year
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Depreciation	$ 322,000	790,000	433,000
Total repairs and maintenance expenses	200,000	200,000	100,000
Impairment charges	0	0	0
Software development costs capitalized	0	0
Amortization expense from capitalized software costs or purchased technology	0	0	0
Software development costs capitalized for internal use software	$ 0	0	0
Tax benefit is measured based on the largest benefit	Greater than 50%
Advertising costs	$ 300,000	200,000	$ 200,000
Accumulated other comprehensive loss	$ (147,000)	$ 42,000
Minimum
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years
Maximum
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	5 years

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - POTENTIALLY DILUTIVE COMMON SHARES EXCLUDED FROM NET INCOME (LOSS) PER SHARE CALCULATION (Detail) - shares shares in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding	676	2,232	2,553
IDchecker closing shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding	83	624	287
Share Purchase Agreement \| Closing Shares \| IDchecker
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding	0	349	63
Share Purchase Agreement \| Earnout Shares \| IDchecker
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding	24	0	0
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding	569	1,259	2,203

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - COMPUTATION OF BASIC AND DILUTED NET INCOME (LOSS) PER SHARE (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share Basic And Diluted [Line Items]
Net income	$ 12,866	$ 616	$ 1,217	$ (607)	$ 960	$ 739	$ 582	$ (322)	$ 955	$ 918	$ 507	$ 146	$ 14,092	$ 1,959	$ 2,526
Weighted-average common shares and share equivalents outstanding—basic (in shares)	33,522	33,024	32,786	32,377	32,086	31,823	31,326	31,094	30,969	30,765	30,697	30,618	33,083	31,587	30,790
Weighted-average common shares and share equivalents outstanding—diluted (in shares)	36,251	35,610	34,815	32,377	34,860	34,532	33,134	31,094	31,664	31,646	31,321	31,174	35,537	33,819	31,480
Net income per share:
Basic (in dollars per share)	$ 0.38	$ 0.02	$ 0.04	$ (0.02)	$ 0.03	$ 0.02	$ 0.02	$ (0.01)	$ 0	$ 0.03	$ 0.02	$ 0.00	$ 0.43	$ 0.06	$ 0.08
Diluted (in dollars per share)	$ 0.35	$ 0.02	$ 0.03	$ (0.02)	$ 0.03	$ 0.02	$ 0.02	$ (0.01)	$ 0	$ 0.03	$ 0.02	$ 0.00	$ 0.40	$ 0.06	$ 0.08
Stock options
Earnings Per Share Basic And Diluted [Line Items]
Dilutive potential common stock equivalents (in shares)													2,454	2,232	690

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SUMMARY OF PROPERTY AND EQUIPMENT (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,186	$ 2,761
Less: accumulated depreciation and amortization	(2,573)	(2,321)
Total property and equipment, net	613	440
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,801	1,492
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	257	248
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,128	$ 1,021

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - COMPONENTS OF COMPERHENSIVE LOSS (Detail) - USD ($)	3 Months Ended												12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 12,866,000	$ 616,000	$ 1,217,000	$ (607,000)	$ 960,000	$ 739,000	$ 582,000	$ (322,000)	$ 955,000	$ 918,000	$ 507,000	$ 146,000	$ 14,092,000	$ 1,959,000	$ 2,526,000
Other comprehensive income:
Foreign currency translation adjustment													208,000	(46,000)	0
Change in unrealized gain (loss) on investments													(19,000)	7,000	5,000
Other comprehensive income													$ 14,281,000	$ 1,920,000	$ 2,531,000

BUSINESS COMBINATION - ADDITIONAL INFORMATION (Detail) - IDchecker - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 17, 2015	Jan. 31, 2016	Sep. 30, 2017	Sep. 30, 2015	Sep. 30, 2016
Business Acquisition [Line Items]
Acquisition date	Jun. 17, 2015
Total consideration paid	$ 5,900
Payments to acquire businesses, gross	5,600
Business combination consideration transfer, promissory notes	300
Common stock issued during acquisition, value	$ 2,700
Common stock issued during acquisition (in shares)	712,790
Earnout shares issued (in shares)		137,306		137,306	81,182
Cash payment to escrow fund related to business acquisition	$ 1,800
Business combination, percentage of closing shares in escrow fund	20.00%
Earnout shares deposited in escrow fund		27,461
Escrow deposit released during period			$ 1,800
Goodwill before effect in exchange rates	$ 2,873

BUSINESS COMBINATION - SCHEDULE OF ESTIMATED FAIR VALUE OF ASSETS ACQUIRED AND LIABILITIES ASSUMED (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Jun. 17, 2015
Business Acquisition [Line Items]
Goodwill	$ 3,014	$ 2,863
IDchecker
Business Acquisition [Line Items]
Current assets			$ 620
Property, plant and equipment			42
Intangible assets			3,570
Assets acquired			4,232
Current liabilities			(476)
Other liabilities			(810)
Liabilities assumed			(1,286)
Fair value of net assets acquired			2,946
Total consideration paid			5,819
Goodwill before effect in exchange rates			$ 2,873
Effect of movements in exchange rates as of September 30, 2017	$ 141

INVESTMENTS - SUMMARY OF INVESTMENTS BY TYPE OF SECURITY (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 34,075	$ 26,810
Gross Unrealized Gains	0	11
Gross Unrealized Losses	(16)	(6)
Fair Market Value	34,059	26,815
US Treasury \| Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	3,897	12,907
Gross Unrealized Gains	0	8
Gross Unrealized Losses	(3)	0
Fair Market Value	3,894	12,915
Corporate debt securities \| Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	26,393	11,949
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(8)	(3)
Fair Market Value	26,385	11,948
Corporate debt securities \| Long-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	3,785	1,954
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(5)	(3)
Fair Market Value	$ 3,780	$ 1,952

INVESTMENTS - SUMMARY OF ACQUISITION-RELATED CONTINGENT CONSIDERATION MEASURED AT FAIR VALUE (Detail) - Contingent Consideration $ in Thousands	12 Months Ended
	Sep. 30, 2017 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at September 30, 2016	$ 252
Expenses recorded due to changes in fair value	412
Issuance of common stock	(310)
Balance at September 30, 2017	$ 354

GOODWILL AND INTANGIBLE ASSETS - ADDITIONAL INFORMATION (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 3,014,000	$ 2,863,000
Goodwill impairment	0
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Amortization of intangible assets	$ 591,000	$ 598,000	$ 172,000
Minimum
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets	5 years
Maximum
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets	6 years

GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF INTANGIBLE ASSETS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Indefinite-lived Intangible Assets [Line Items]
Cost	$ 3,570
Accumulated Amortization	1,273
Net	$ 2,297	$ 2,783
Completed technologies
Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	6 years
Cost	$ 2,370
Accumulated Amortization	833
Net	$ 1,537
Customer relationships
Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	6 years
Cost	$ 970
Accumulated Amortization	341
Net	$ 629
Trade names
Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	5 years
Cost	$ 230
Accumulated Amortization	99
Net	$ 131

GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF ESTIMATED FUTURE AMORTIZATION EXPENSE (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
2018	$ 632
2019	632
2020	618
2021	415
2022	0
Net	$ 2,297	$ 2,783

STOCKHOLDERS' EQUITY - ADDITIONAL INFORMATION (Detail) - USD ($)		1 Months Ended	9 Months Ended	12 Months Ended
	Jun. 17, 2015	Jan. 31, 2016	Sep. 30, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Mar. 10, 2017	Mar. 09, 2017	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated average forfeiture rate				12.00%
Excess tax benefit on stock option exercises				$ 0	$ 0	$ 0
Unrecognized compensation expense				$ 10,700,000
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				1 year 11 months 19 days
Purchase of common stock (in shares)			3,647,705	2,845,866	3,015,374	3,647,705			2,334,326
Recognized compensation expense				$ 5,478,000	$ 4,079,000	$ 3,367,000
Total intrinsic value of options exercised				$ 1,400,000	$ 3,300,000	$ 600,000
Weighted average fair value of options granted (in dollars per share)				$ 4.28	$ 3.29	$ 2.83
Aggregate intrinsic value of options				$ 15,600,000	$ 14,200,000
Percentage of earnout shares vest and eligible for resale					12.50%
Percentage of remaining earnout shares vest and eligible for resale					87.50%
Earnout Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense				$ 412,000	$ 292,000	$ 47,000
Common stock trading period				10 days
IDchecker
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued during acquisition (in shares)	712,790
Earnout shares issued (in shares)		137,306	137,306		81,182
IDchecker \| Closing Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense				$ 1,200,000	$ 1,200,000	$ 300,000
Unrecognized compensation expense				$ 0
Common stock issued during acquisition (in shares)	712,790
Vesting period of shares received	27 months
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance units, threshold for partial vesting (in dollars per share)				$ 16.00
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				2 years 6 months 26 days
Options outstanding (in shares)			802,917	2,357,021	2,046,169	802,917			1,101,303
Recognized compensation expense				$ 4,000,000	$ 2,700,000	$ 1,200,000
Unrecognized compensation expense				$ 9,300,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				1 year 5 months 19 days
Recognized compensation expense				$ 1,000,000	$ 1,300,000	$ 2,200,000
Unrecognized compensation expense				$ 1,300,000
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)							9,500,000	6,000,000
Purchase of common stock (in shares)				1,769,138
Number of common stock reserved for future grants (in shares)				2,464,202
2012 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)				1,803,165
2012 Plan \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)				2,100,000
Recognized compensation expense				$ 400,000
Shares granted in period				2,400,000
Performance measurement period				25 days
Target stock price for full vesting (in dollars per share)				$ 20.00
Percent of RSUs converting into shares following performance shares				50.00%
RSUs converting into shares following performance period, conversion ratio				1
Performance units, percentage of RSUs vesting pending participants' continued employment				50.00%
Vesting pending participants' continued employment, required employment period				1 year
Average stock price, measurement period				20 days
RSUs aggregate fair value				$ 4,200,000
2012 Plan \| Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance units, threshold for partial vesting (in dollars per share)				$ 16.00
Vesting percentage if stock price underperforms benchmark				25.00%
Vesting percentage if stock price exceeds benchmark				50.00%
2012 Plan \| Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance units, threshold for partial vesting (in dollars per share)				$ 20.00
Vesting percentage if stock price underperforms benchmark				50.00%
Vesting percentage if stock price exceeds benchmark				100.00%
2012 Plan \| Performance Shares \| Chief Financial Officer \| Former Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in period				300,000
Prior Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)				1,076,728
Director Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock reserved for future grants (in shares)				521,315
Director Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)							1,500,000	1,000,000
Purchase of common stock (in shares)				553,856

STOCKHOLDERS' EQUITY - FAIR VALUE CALCULATIONS FOR STOCK-BASED COMPENSATION AWARDS (Detail)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Equity [Abstract]
Risk-free interest rate, Minimum	1.68%	1.43%	1.29%
Risk-free interest rate, Maximum	1.92%	1.66%	1.66%
Expected life (years)	5 years 3 months	5 years 10 months 24 days	5 years 3 months 18 days
Expected volatility rate	74.00%	83.00%	90.00%
Expected dividend rate	0.00%	0.00%	0.00%

STOCKHOLDERS' EQUITY - STOCK-BASED COMPENSATION EXPENSE RELATED TO STOCK OPTIONS AND RSUs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to employee stock options included in operating expenses	$ 5,478	$ 4,079	$ 3,367
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to employee stock options included in operating expenses	52	39	30
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to employee stock options included in operating expenses	1,577	1,099	713
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to employee stock options included in operating expenses	1,028	660	592
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to employee stock options included in operating expenses	$ 2,821	$ 2,281	$ 2,032

STOCKHOLDERS' EQUITY - STOCK OPTION ACTIVITY (Detail) - $ / shares	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Number of Shares
Beginning balance (in shares)	3,015,374	3,647,705	2,334,326
Granted (in shares)	147,800	98,500	1,927,500
Exercised (in shares)	(235,514)	(661,663)	(232,203)
Cancelled (in shares)	(81,794)	(69,168)	(381,918)
Ending balance (in shares)	2,845,866	3,015,374	3,647,705	2,334,326
Weighted Average Exercise Price Per Share
Beginning balance (in dollars per share)	$ 3.95	$ 3.70	$ 4.11
Granted (in dollars per share)	7.06	4.51	2.92
Exercised (in dollars per share)	2.92	2.67	1.06
Cancelled (in dollars per share)	3.59	4.51	3.85
Ending balance (in dollars per share)	$ 4.21	$ 3.95	$ 3.70	$ 4.11
Additional Disclosures
Weighted Average Remaining Contractual Term (in Years)	5 years 5 months 1 day	6 years 4 months 24 days	7 years 2 months 12 days	5 years 5 months 16 days

STOCKHOLDERS' EQUITY - RSU ACTIVITY (Detail) - RSUs - $ / shares	9 Months Ended	12 Months Ended
	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Number of shares
Beginning balance (in shares)	2,046,169	2,046,169	802,917	1,101,303
Granted (in shares)		1,249,224	1,536,000	104,000
Settled (in shares)		(707,174)	(261,621)	(255,041)
Cancelled (in shares)		(231,198)	(31,127)	(147,345)
Ending balance (in shares)		2,357,021	2,046,169	802,917
Weighted- average fair value per share
Beginning balance (in dollars per share)	$ 4.90	$ 4.90	$ 4.49	$ 4.71
Granted (in dollars per share)	6.61		4.82	2.29
Settled (in dollars per share)	4.81		4.77	2.96
Cancelled (in dollars per share)	4.93		4.19	3.54
Ending balance (in dollars per share)	$ 5.65		$ 4.90	$ 4.49

INCOME TAXES - INCOME TAX (PROVISION) BENEFIT (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income (Loss) before taxes by component
Domestic													$ 4,057	$ 2,732	$ 1,994
Foreign													(886)	(774)	(11)
Income before income taxes													3,171	1,958	1,983
Federal—current													(127)	(129)	(84)
Federal—deferred													8,291	0	621
State—current													(20)	(16)	(10)
State—deferred													2,748	0	13
Foreign—current													29	146	3
Total	$ 11,012	$ (17)	$ (74)	$ 0	$ 96	$ 0	$ (79)	$ (16)	$ (32)	$ 578	$ 0	$ (3)	$ 10,921	$ 1	$ 543

INCOME TAXES - COMPANY'S NET DEFERRED TAX ASSETS AND LIABILITIES (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Deferred tax assets:
Stock based compensation	$ 3,671	$ 2,898
Net operating loss carryforwards	3,453	7,095
Research credit carryforwards	3,171	44
AMT credit carryforwards	392	279
Foreign net operating losses	386	327
Other, net	770	320
Total deferred assets	11,843	10,963
Deferred tax liabilities:
Intangibles	(393)	(473)
Foreign deferred liabilities	(280)	(356)
Net deferred tax asset	11,170	10,134
Valuation allowance for net deferred tax assets	(105)	(10,163)
Net deferred tax asset	$ 11,065
Net deferred tax (liability)		$ (29)

INCOME TAXES - ADDITIONAL INFORMATION (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Line Items]
Net change in total valuation allowance	$ 10,100,000	$ 1,900,000
Investment credit carryforwards	3,171,000	44,000
Alternative minimum tax credit carryforwards	$ 392,000	$ 279,000
Research and development credits expiry period beginning year	2027
Research and development credit carryforwards	$ 1,600,000
Accrued interest or penalties	0
Research and development credit
Income Taxes [Line Items]
Investment credit carryforwards	1,900,000
Federal
Income Taxes [Line Items]
Net operating loss carryforwards	$ 29,400,000
Operating loss carryforwards, expiration start year	2032
State
Income Taxes [Line Items]
Net operating loss carryforwards	$ 29,400,000
Net operating loss carryforwards will begin to expire	2028
Federal and state
Income Taxes [Line Items]
Net operating loss carryforwards	$ 21,100,000

INCOME TAXES - INCOME TAXES COMPUTED USING FEDERAL INCOME TAX RATE (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Amount computed using statutory rate													$ (1,078)	$ (666)	$ (674)
Net change in valuation allowance for net deferred tax assets													10,058	1,889	1,619
AMT and other													20	(148)	151
Foreign rate differential													(169)	(70)	(1)
Non-deductible items													(370)	(1,136)	(182)
State income tax													(34)	(15)	(370)
Foreign net operating loss													0	147	0
Research and development credits													2,494	0	0
Total	$ 11,012	$ (17)	$ (74)	$ 0	$ 96	$ 0	$ (79)	$ (16)	$ (32)	$ 578	$ 0	$ (3)	$ 10,921	$ 1	$ 543

INCOME TAXES - UNRECOGNIZED TAX BENEFITS ROLLFORWARD (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits at the beginning of the year	$ 0	$ 0	$ 0
Additions from tax positions taken in the current year	140	0	0
Additions from tax positions taken in prior years	1,041	0	0
Reductions from tax positions taken in prior years	0	0	0
Tax settlements	0	0	0
Gross unrecognized tax benefits at end of the year	1,181	$ 0	$ 0
Unrecognized tax benefits that will impact the company's effective tax rate	$ 1,200

COMMITMENTS AND CONTINGENCIES - ADDITIONAL INFORMATION (Detail) € in Thousands, £ in Thousands, $ in Thousands				12 Months Ended
	Jul. 20, 2016 patent	Sep. 08, 2014 complaint	May 16, 2014 patent	Sep. 30, 2017 USD ($) ft²	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2017 GBP (£) ft²	Sep. 30, 2017 EUR (€) ft²
Loss Contingencies [Line Items]
Company contribution, percent of designated deferral of eligible compensation				25.00%
Company contribution, percent of employee compensation eligible for company match				6.00%
Employer contribution amount				$ 121	$ 91	$ 42
Commencement date of term of lease				Oct. 01, 2016
Expiration date of term of lease				Apr. 30, 2020
Annual base rent				$ 600
Tenant improvement allowances				$ 300
Previous facility lease termination date				Oct. 16, 2016
Unamortized lease incentives				$ 49
Rent expense for the Company's operating leases				$ 600	$ 300	$ 400
IDchecker
Loss Contingencies [Line Items]
Expiration date of term of lease				May 31, 2020
Annual base rent \| €								€ 48
Building
Loss Contingencies [Line Items]
Amended office space subject to the lease (in square feet) \| ft²				28,791			28,791	28,791
Sales office
Loss Contingencies [Line Items]
Expiration date of term of lease				May 31, 2018
Annual base rent \| £							£ 77
Rothschild Mobile Imaging Innovations, Inc. Patent Infringement
Loss Contingencies [Line Items]
Number of patents infringed upon \| patent			4
Number of new claims filed \| complaint		3
Number of patents found not infringed upon \| patent	4

COMMITMENTS AND CONTINGENCIES - FUTURE ANNUAL MINIMUM RENTAL PAYMENTS PAYABLE (Detail) $ in Thousands	Sep. 30, 2017 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018	$ 917
2019	867
2020	498
2021	25
2022	12
Thereafter	0
Total	$ 2,319

REVENUE AND VENDOR CONCENTRATIONS - ADDITIONAL INFORMATION (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Revenue, Major Customer [Line Items]
Revenue	$ 12,904	$ 11,798	$ 11,419	$ 9,269	$ 9,670	$ 9,105	$ 8,522	$ 7,404	$ 7,866	$ 6,440	$ 5,672	$ 5,389	$ 45,390	$ 34,701	$ 25,367
Accounts receivable, net	7,099				4,949								7,099	4,949
Customer Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 1,300				$ 1,000				$ 1,100				$ 1,300	$ 1,000	$ 1,100
Customer Concentration Risk \| Sales Revenue, Net
Revenue, Major Customer [Line Items]
Total revenue, percentage													10.00%	10.00%	10.00%
Geographic Concentration Risk \| Sales Revenue, Net
Revenue, Major Customer [Line Items]
Total revenue, percentage													14.00%	15.00%	5.00%
Customer One \| Customer Concentration Risk \| Sales Revenue, Net
Revenue, Major Customer [Line Items]
Revenue													$ 10,400	$ 6,300	$ 6,300
Total revenue, percentage													23.00%	18.00%	25.00%
Channel Partners \| Supplier Concentration Risk \| Sales Revenue, Net
Revenue, Major Customer [Line Items]
Total revenue, percentage													10.00%

QUARTERLY INFORMATION (UNAUDITED) - SCHEDULE OF QUARTERLY FINANCIAL DATA (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 12,904	$ 11,798	$ 11,419	$ 9,269	$ 9,670	$ 9,105	$ 8,522	$ 7,404	$ 7,866	$ 6,440	$ 5,672	$ 5,389	$ 45,390	$ 34,701	$ 25,367
Cost of revenue	1,138	1,182	830	891	940	793	720	942	825	591	558	497
Operating expenses	10,033	10,132	9,365	9,050	7,889	7,618	7,171	6,804	6,079	5,539	4,628	4,758
Operating income	1,733	484	1,224	(672)	841	694	631	(342)	962	310	486	134	2,769	1,824	1,892
Other income, net	121	149	67	65	23	45	30	36	25	30	21	15	402	134	91
Income tax benefit (provision)	11,012	(17)	(74)	0	96	0	(79)	(16)	(32)	578	0	(3)	10,921	1	543
Net income	$ 12,866	$ 616	$ 1,217	$ (607)	$ 960	$ 739	$ 582	$ (322)	$ 955	$ 918	$ 507	$ 146	$ 14,092	$ 1,959	$ 2,526
Net income (loss) per share:
Basic income (loss) per share (in dollars per share)	$ 0.38	$ 0.02	$ 0.04	$ (0.02)	$ 0.03	$ 0.02	$ 0.02	$ (0.01)	$ 0	$ 0.03	$ 0.02	$ 0.00	$ 0.43	$ 0.06	$ 0.08
Shares used in calculating net income per share—basic	33,522	33,024	32,786	32,377	32,086	31,823	31,326	31,094	30,969	30,765	30,697	30,618	33,083	31,587	30,790
Diluted income (loss) per share (in dollars per share)	$ 0.35	$ 0.02	$ 0.03	$ (0.02)	$ 0.03	$ 0.02	$ 0.02	$ (0.01)	$ 0	$ 0.03	$ 0.02	$ 0.00	$ 0.40	$ 0.06	$ 0.08
Shares used in calculating net income (loss) per share - diluted	36,251	35,610	34,815	32,377	34,860	34,532	33,134	31,094	31,664	31,646	31,321	31,174	35,537	33,819	31,480

SUBSEQUENT EVENT (Details) - ICAR Vision Systems, S.L. - Subsequent Event $ in Millions	Oct. 16, 2017 USD ($) shares
Subsequent Event [Line Items]
Total consideration paid	$ 15.0
Payments to acquire businesses, gross	4.1
Common stock issued during acquisition, value	$ 5.6
Acquisition-related closing shares (in shares) \| shares	584,291
Contingent consideration pending achievement of certain financial milestones	$ 5.3

INVESTMENTS - SUMMARY OF FAIR VALUE OF INVESTMENTS MEASURED ON A RECURRING BASIS (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	$ 34,059	$ 26,815
Acquisition-related contingent consideration	354	252
Total liabilities at fair value	354	252
Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	30,279	24,863
Short-term investments \| US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	3,894	12,915
Short-term investments \| Corporate debt securities \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	3,041	3,963
Short-term investments \| Corporate debt securities \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	9,503	4,445
Short-term investments \| Commercial paper \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	10,850	2,843
Short-term investments \| Commercial paper \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	2,991	697
Long-term investments \| US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0
Long-term investments \| Corporate debt securities \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	1,858	502
Long-term investments \| Corporate debt securities \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	1,922	1,450
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	3,894	12,915
Acquisition-related contingent consideration	0	0
Total liabilities at fair value	0	0
Quoted Prices in Active Markets (Level 1) \| Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	3,894	12,915
Quoted Prices in Active Markets (Level 1) \| Short-term investments \| US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	3,894	12,915
Quoted Prices in Active Markets (Level 1) \| Short-term investments \| Corporate debt securities \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Quoted Prices in Active Markets (Level 1) \| Short-term investments \| Corporate debt securities \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Quoted Prices in Active Markets (Level 1) \| Short-term investments \| Commercial paper \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Quoted Prices in Active Markets (Level 1) \| Short-term investments \| Commercial paper \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Quoted Prices in Active Markets (Level 1) \| Long-term investments \| US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0
Quoted Prices in Active Markets (Level 1) \| Long-term investments \| Corporate debt securities \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Quoted Prices in Active Markets (Level 1) \| Long-term investments \| Corporate debt securities \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	30,165	13,900
Acquisition-related contingent consideration	0	0
Total liabilities at fair value	0	0
Significant Other Observable Inputs (Level 2) \| Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	26,385	11,948
Significant Other Observable Inputs (Level 2) \| Short-term investments \| US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Significant Other Observable Inputs (Level 2) \| Short-term investments \| Corporate debt securities \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	3,041	3,963
Significant Other Observable Inputs (Level 2) \| Short-term investments \| Corporate debt securities \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	9,503	4,445
Significant Other Observable Inputs (Level 2) \| Short-term investments \| Commercial paper \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	10,850	2,843
Significant Other Observable Inputs (Level 2) \| Short-term investments \| Commercial paper \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	2,991	697
Significant Other Observable Inputs (Level 2) \| Long-term investments \| US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0
Significant Other Observable Inputs (Level 2) \| Long-term investments \| Corporate debt securities \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	1,858	502
Significant Other Observable Inputs (Level 2) \| Long-term investments \| Corporate debt securities \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	1,922	1,450
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Acquisition-related contingent consideration	354	252
Total liabilities at fair value	354	252
Significant Unobservable Inputs (Level 3) \| Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Significant Unobservable Inputs (Level 3) \| Short-term investments \| US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Significant Unobservable Inputs (Level 3) \| Short-term investments \| Corporate debt securities \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Significant Unobservable Inputs (Level 3) \| Short-term investments \| Corporate debt securities \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Significant Unobservable Inputs (Level 3) \| Short-term investments \| Commercial paper \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Significant Unobservable Inputs (Level 3) \| Short-term investments \| Commercial paper \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Significant Unobservable Inputs (Level 3) \| Long-term investments \| US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0
Significant Unobservable Inputs (Level 3) \| Long-term investments \| Corporate debt securities \| Financial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Significant Unobservable Inputs (Level 3) \| Long-term investments \| Corporate debt securities \| Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	$ 0	$ 0

INVESTMENTS - ADDITIONAL INFORMATION (Detail) - USD ($)	12 Months Ended
INVESTMENTS - ADDITIONAL INFORMATION (Detail) - USD ($)	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Other-than-temporary impairment charges recognized	$ 0	$ 0	$ 0