Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Sep. 30, 2016	Nov. 30, 2016	Mar. 31, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
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		33,081,039
Entity Public Float			$ 205,961,297

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Current assets:
Cash and cash equivalents	$ 9,010	$ 2,753
Short-term investments	24,863	23,921
Accounts receivable, net	4,949	3,937
Other current assets	1,485	798
Total current assets	40,307	31,409
Long-term investments	1,952
Property and equipment, net	440	975
Intangible assets, net	2,783	3,397
Goodwill	2,863	2,873
Other non-current assets	40	92
Total assets	48,385	38,746
Current liabilities:
Accounts payable	1,318	1,538
Accrued payroll and related taxes	3,263	2,061
Deferred revenue, current portion	3,391	3,516
Other current liabilities	355	289
Total current liabilities	8,327	7,404
Deferred revenue, non-current portion	259	222
Other non-current liabilities	314	687
Total liabilities	8,900	8,313
Stockholders’ equity
Preferred stock, $0.001 par value, 1,000,000 shares authorized, none issued and outstanding
Common stock, $0.001 par value, 60,000,000 shares authorized, 32,781,704 and 31,721,114 issued and outstanding, respectively	33	32
Additional paid-in capital	71,036	63,905
Accumulated other comprehensive loss	(42)	(3)
Accumulated deficit	(31,542)	(33,501)
Total stockholders’ equity	39,485	30,433
Total liabilities and stockholders’ equity	$ 48,385	$ 38,746

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2016	Sep. 30, 2015
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 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	$ 0.001	$ 0.001
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	32,781,704	31,721,114
Common stock, shares outstanding	32,781,704	31,721,114

Consolidated Statements of Operations and Other Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Revenue
Software	$ 22,586,000	$ 17,870,000	$ 13,312,000
SaaS, maintenance and consulting	12,115,000	7,497,000	5,838,000
Total revenue	34,701,000	25,367,000	19,150,000
Operating costs and expenses
Cost of revenue-software	953,000	992,000	1,001,000
Cost of revenue-SaaS, maintenance and consulting	2,442,000	1,479,000	1,147,000
Selling and marketing	10,937,000	6,458,000	6,836,000
Research and development	7,794,000	5,577,000	6,020,000
General and administrative	8,575,000	7,601,000	9,554,000
Acquisition-related costs and expenses	2,176,000	1,368,000
Total operating costs and expenses	32,877,000	23,475,000	24,558,000
Operating income (loss)	1,824,000	1,892,000	(5,408,000)
Other income (expense), net	134,000	91,000	118,000
Income (loss) before income taxes	1,958,000	1,983,000	(5,290,000)
Income tax benefit (provision)	1,000	543,000	(2,000)
Net income (loss)	$ 1,959,000	$ 2,526,000	$ (5,292,000)
Net income (loss) per share—basic	$ 0.06	$ 0.08	$ (0.17)
Net income (loss) per share—diluted	$ 0.06	$ 0.08	$ (0.17)
Shares used in calculating net income (loss) per share—basic	31,586,535	30,790,258	30,466,063
Shares used in calculating net income (loss) per share—diluted	33,818,501	31,480,241	30,466,063
Other comprehensive income (loss):
Net income (loss)	$ 1,959,000	$ 2,526,000	$ (5,292,000)
Foreign currency translation adjustment	(46,000)	0	0
Unrealized gain (loss) on investments	7,000	5,000	(10,000)
Other comprehensive income (loss)	$ 1,920,000	$ 2,531,000	$ (5,302,000)

Consolidated Statements of Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Common Stock [Member] IDchecker [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Sep. 30, 2013	$ 25,729,000	$ 30,000		$ 56,432,000	$ (30,735,000)	$ 2,000
Beginning Balance, shares at Sep. 30, 2013		30,361,442
Exercise of stock options	$ 119,000	$ 1,000		118,000
Exercise of stock options, shares	108,135	105,280
Settlement of restricted stock units	$ (48,000)			(48,000)
Settlement of restricted stock units, shares		54,358
Stock-based compensation expense	3,444,000			3,444,000
Components of other comprehensive income:
Net income (loss)	(5,292,000)				(5,292,000)
Currency translation adjustment	0
Change in unrealized gain (loss) on investments	(10,000)					(10,000)
Other comprehensive income (loss)	(5,302,000)
Ending Balance at Sep. 30, 2014	23,942,000	$ 31,000		59,946,000	(36,027,000)	(8,000)
Ending Balance, shares at Sep. 30, 2014		30,521,080
Exercise of stock options	$ 246,000			246,000
Exercise of stock options, shares	232,203	232,203
Settlement of restricted stock units, shares		255,041
Acquisition-related closing shares	$ 347,000	$ 1,000		346,000
Acquisition-related closing shares, shares		712,790
Stock-based compensation expense	3,367,000			3,367,000
Components of other comprehensive income:
Net income (loss)	2,526,000				2,526,000
Currency translation adjustment	0
Change in unrealized gain (loss) on investments	5,000					5,000
Other comprehensive income (loss)	2,531,000
Ending Balance at Sep. 30, 2015	$ 30,433,000	$ 32,000		63,905,000	(33,501,000)	(3,000)
Ending Balance, shares at Sep. 30, 2015	31,721,114	31,721,114
Exercise of stock options	$ 1,755,000	$ 1,000		1,754,000
Exercise of stock options, shares	661,663	661,663
Settlement of restricted stock units, shares		261,621
Acquisition-related closing shares, shares			137,306
Stock-based compensation expense	$ 4,079,000			4,079,000
Amortization of closing shares	1,298,000			1,298,000
Components of other comprehensive income:
Net income (loss)	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 (loss)	1,920,000
Ending Balance at Sep. 30, 2016	$ 39,485,000	$ 33,000		$ 71,036,000	$ (31,542,000)	$ (42,000)
Ending Balance, shares at Sep. 30, 2016	32,781,704	32,781,704

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
Consolidated Statements of Cash Flows - USD ($)	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES
Net income (loss)	$ 1,959,000	$ 2,526,000	$ (5,292,000)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Stock-based compensation expense	4,079,000	3,367,000	3,444,000
Amortization of closing and earnout shares	1,503,000	393,000
Amortization of intangible assets	598,000	172,000	0
Depreciation	790,000	433,000	471,000
Accretion and amortization on debt securities	149,000	426,000	401,000
Other		9,000	(5,000)
Changes in assets and liabilities:
Accounts receivable	(1,002,000)	(566,000)	(1,455,000)
Other assets	(586,000)	(533,000)	(88,000)
Accounts payable	(222,000)	(449,000)	(84,000)
Accrued payroll and related taxes	1,197,000	480,000	(20,000)
Deferred revenue	(67,000)	478,000	291,000
Deferred taxes	(127,000)	(647,000)
Other liabilities	(417,000)	16,000	(132,000)
Net cash provided by (used in) operating activities	7,854,000	6,105,000	(2,469,000)
INVESTING ACTIVITIES
Purchases of investments	(33,658,000)	(27,254,000)	(24,643,000)
Sales and maturities of investments	30,623,000	21,406,000	11,667,000
Acquisition, net of cash acquired		(5,423,000)
Purchases of property and equipment	(250,000)	(73,000)	(135,000)
Sale of property and equipment			1,000
Net cash used in investing activities	(3,285,000)	(11,344,000)	(13,110,000)
FINANCING ACTIVITIES
Proceeds from exercise of stock options	1,755,000	246,000	70,000
Principal payments on capital lease obligations	(22,000)	(20,000)	(19,000)
Net cash provided by financing activities	1,733,000	226,000	51,000
Foreign currency effect on cash and cash equivalents	(45,000)	(1,000)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	6,257,000	(5,014,000)	(15,528,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	2,753,000	7,767,000	23,295,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	9,010,000	2,753,000	7,767,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	1,000	4,000	6,000
Cash paid for income taxes	17,000	105,000	2,000
NON-CASH FINANCING AND INVESTING ACTIVITIES
Settlement of note receivable as consideration for business acquisition		250,000
Unrealized gain (loss) on investments	$ 7,000	$ 5,000	$ (10,000)

Nature of Operations and Summary of Significant Accounting Policies

12 Months Ended

Sep. 30, 2016

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Nature of Operations and Summary of Significant Accounting Policies

1. NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations

Mitek Systems, Inc. (the “Company”) develops, markets and sells proprietary mobile capture and identity verification software solutions for enterprise customers.

The Company applies its patented technology in image capture, correction and intelligent data extraction in the mobile financial and business services markets. The Company’s technology allows users to remotely deposit checks, open accounts, get insurance quotes, pay bills as well as verify their identity by taking pictures of various documents with their camera-equipped smartphones and tablets instead of using the device keyboard. As of September 30, 2016, the Company’s has been granted 27 patents and it has an additional 16 patent applications pending.

The Mobile Verify™ products combine the Mitek MiSnap auto capture experience with a variety of advanced computer vision techniques to provide verification of ID documents. Mobile Verify provides a check of authenticity of U.S state-issued driver’s licenses and includes full global coverage. These products enable banks and other businesses to improve KYC processes. Mobile Fill™ enables the camera to serve as a keyboard. Using Mobile Fill, consumers can quickly pre-fill any form with personal data by simply snapping a picture of their driver license, credit card, or other document. The Company’s Mobile Deposit^® product is software that allows users to remotely deposit a check using their camera-equipped smartphone or tablet. As of September 30, 2016, over 5,400 financial institutions 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 mobile imaging software solutions are available for iOS and Android operating systems.

The Company markets and sells the Mitek Mobile Identity Suite of mobile capture and identity verification software products directly to enterprise customers or through channel partners. These software solutions are embedded in mobile banking or enterprise applications developed by banks, insurance companies or their partners, and then marketed under their own proprietary brands.

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 its 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 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 in fiscal 2015 and 2014.

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 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 2016, management completed its annual goodwill impairment test as of September 30, 2016 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 as of September 30, 2016 to its market capitalization.

Because the Company determines the fair value of its reporting unit based on our 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 (Loss) Per Share

The Company calculates net income (loss) per share in accordance with FASB ASC Topic 260, Earnings per Share. Basic net income (loss) per share is based on the weighted average number of common shares outstanding during the period. Diluted net income (loss) 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.

At September 30, 2016, 2015 and 2014, the following potentially dilutive common shares were excluded from the net income (loss) per share calculation, as they would have been antidilutive:

	2016		2015		2014
Stock options		1,258,844		2,202,844		2,334,326
Warrants		—		—		6,667
Restricted stock units		623,883		287,147		1,101,303
IDchecker shares		349,239		63,037		—
Total potentially dilutive common shares outstanding		2,231,966		2,553,028		3,442,296

The computation of basic and diluted net income (loss) per share for the fiscal years ended September 30, 2016, 2015 and 2014 is as follows (amounts in thousands, except share data):

	2016		2015		2014
Net income (loss)	$	1,959	$	2,526	$	(5,292	)
Weighted-average common shares and share equivalents outstanding—basic		31,586,535		30,790,258		30,466,063
Dilutive potential common stock equivalents		2,231,966		689,983		—
Weighted-average common shares and share equivalents outstanding—diluted		33,818,501		31,480,241		30,466,063
Net income (loss) per share:
Basic	$	0.06	$	0.08	$	(0.17	)
Diluted	$	0.06	$	0.08	$	(0.17	)

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, and commercial paper. 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 (loss). No other-than-temporary impairment charges were recognized in the fiscal years ended September 30, 2016, 2015 and 2014.

All investments whose maturity or sale is expected within one year are classified as “current” on the balance sheet. All other securities are classified as “long-term” on the 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 years ended September 30, 2016 and 2015, respectively. The Company maintained an allowance for doubtful accounts of $35,000 and $13,000 as of September 30, 2016 and September 30, 2015, 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 statements of operations and other comprehensive income (loss) 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, 2016 and 2015 (amounts shown in thousands):

	2016			2015
Property and equipment—at cost:
Equipment	$	1,476		$	1,281
Furniture and fixtures		249			229
Leasehold improvements		1,018			995
		2,743			2,505
Less: accumulated depreciation and amortization		(2,303	)		(1,530	)
Total property and equipment, net	$	440		$	975

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 lease term. Depreciation and amortization of property and equipment totaled $0.8 million, $0.4 million and $0.5 million for the fiscal years ended September 30, 2016, 2015 and 2014, respectively. Included in property and equipment as of September 30, 2016 and 2015 in the table above is equipment of $0.1 million purchased under a capital lease. Depreciation expense related to the equipment purchased under the capital lease was $19,000 in the fiscal years ended September 30, 2016, 2015 and 2014, respectively, and accumulated depreciation was $0.1 million in each of the years ended September 30, 2016 and 2015, respectively. Expenditures for repairs and maintenance are charged to operations. Total repairs and maintenance expenses were $0.2 million, $0.1 million and $0.1 million for the fiscal years ended September 30, 2016, 2015 and 2014, 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, 2016, 2015 and 2014.

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, 2016 and 2015, 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.

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 $0.2 million, $0.2 million and $0.1 million during the fiscal years ended September 30, 2016, 2015 and 2014, 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, 2016, management determined that the Company has only one operating segment: the development, sale and service of proprietary software solutions related to mobile imaging.

Comprehensive Loss

Comprehensive loss consists of net loss 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, 2016, 2015 and 2014 (amounts shown in thousands):

	2016			2015		2014
Net income (loss)	$	1,959		$	2,526	$	(5,292	)
Other comprehensive income (loss):
Foreign currency translation adjustment		(46	)		—		—
Change in unrealized gains (losses) on marketable securities		7			5		(10	)
Total comprehensive income (loss)	$	1,920		$	2,531	$	(5,302	)

Included on the balance sheet at September 30, 2016 is an accumulated other comprehensive loss of $42,000, compared to an accumulated other comprehensive loss of $3,000 at September 30, 2015.

Recent Accounting Pronouncements

On November 20, 2015, the FASB issued Accounting Standards Update (“ASU”) No 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes (“ASU 2015-17”), 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 31, 2016 and interim periods therein. Early adoption is permitted as of the beginning of interim or annual reporting periods. The Company has adopted the standard prospectively as of September 30, 2016 and no adjustment was made to prior periods.

In May 2014, the FASB issued guidance codified in ASC No. 606, Revenue Recognition – Revenue from Contracts with Customers (“ASC 606”), which amends the guidance in former ASC No. 605, Revenue Recognition. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2019. The Company is currently evaluating the impact of the provisions of ASC 606 on its consolidated financial statements.

In September 2015, the FASB issued 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 does not believe the adoption of ASU 2015-16 will have a material impact on its consolidated financial statements

In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments—Overall (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 is intended to provide users of financial statements with more useful information on the recognition, measurement, presentation, and disclosure of financial instruments. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017 with early adoption permitted. The Company is assessing the impact of adopting ASU 2016-01 on its consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02), which requires lessees to recognize assets and liabilities for operating leases with lease terms greater than twelve months in the balance sheet. The update also requires improved disclosures to help users of financial statements better understand the amount, timing and uncertainty of cash flows arising from leases. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the impact of the adoption of ASU 2016-02 on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-19”), as part of the initiative to reduce complexity in accounting standards. The areas for simplification in ASU 2016-09 involve several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, or classification on the statement of cash flows. ASU 2016-09 is effective for the Company beginning in its first quarter of fiscal 2018. The Company is currently evaluating the impact of adopting the new stock compensation standard 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

Business Combination

12 Months Ended

Sep. 30, 2016

Business Combinations [Abstract]

Business Combination

2. BUSINESS COMBINATION

On June 17, 2015, the Company completed the acquisition (the “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 Acquisition, IDC NL and IDC Inc became wholly owned subsidiaries of the Company. IDchecker is a provider of cloud-based identification document verification services.

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 Acquisition, the Company paid a purchase price of $5.9 million, which consists 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. In addition, approximately $2.7 million in shares of the Company’s common stock (the “Closing Shares”), par value $0.001 per share (“Common Stock”), or 712,790 shares, were issued to the Sellers, and subject to the achievement of certain revenue and net income targets by IDchecker for the nine-month period ending on September 30, 2015, and the twelve-month period ending on September 30, 2016, the Company will issue to the Sellers up to an aggregate of $2.0 million in shares of Common Stock (the “Earnout Shares”). Vesting of both the Closing Shares and Earnout Shares (if any) 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 ASC 718 Compensation – Stock Compensation. For additional information regarding the Closing Shares and Earnout Shares, see Note 5 to these consolidated financial statements.

Upon the closing of the 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. To the extent any Earnout Shares are issued to the Sellers, 20% of such Earnout Shares will be placed in the escrow fund. The escrow fund will be maintained for up to 24 months following the last issuance of Earnout Shares or until such earlier time as the escrow fund is exhausted.

The purchase price is subject to a post-closing adjustment in net working capital as provided in the Share Purchase Agreement.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as part of the 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	$	2,873
Effect of movements in exchange rates		(10	)
Goodwill	$	2,863

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 discount rates and the determination of the estimated useful lives of the intangible assets, see Note 4. 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. The goodwill recognized is due to expected synergies and other factors and it is not expected to be deductible for income tax purposes.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 805
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-Section 50
-Paragraph 4
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Investments

12 Months Ended

Sep. 30, 2016

Investments Debt And Equity Securities [Abstract]

Investments

3. 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, 2016 and 2015, 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, 2016, 2015 and 2014.

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 table summarizes investments by security type as of September 30, 2016 and 2015 (amounts shown in thousands):

	September 30, 2016
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
US Treasury	$	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

	September 30, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
Corporate debt securities, short-term	$	23,924	$	3	$	(6	)	$	23,921
Total	$	23,924	$	3	$	(6	)	$	23,921

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 (loss) and resulted from updates to assumed probability of achievement of the performance targets and adjustments to the inputs discussed previously (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, 2016:
Assets:
Short-term investments:
US Treasury	$	12,915	$	12,915	$	—	$	—
Corporate debt securities
Financial		3,963		—		3,963		—
Industrial		4,445		—		4,445		—
Commercial paper
Industrial		697		—		697		—
Financial		2,843		—		2,843		—
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

September 30, 2015:
Assets:
Short-term investments:
Corporate debt securities
Financial	$	10,308	$	—	$	10,308	$	—
Industrial		9,665		—		9,665		—
Utility		1,802		—		1,802		—
Commercial paper
Industrial		1,448		—		1,448		—
Financial		698		—		698		—
Total assets at fair value	$	23,921	$	—	$	23,921	$	—
Liabilities:
Acquisition-related contingent consideration		47		—		—		47
Total liabilities at fair value	$	47	$	—	$	—	$	47

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, 2016 (amounts shown in thousands):

Balance at September 30, 2015	$	47
Expenses recorded due to changes in fair value		293
Issuance of common stock		(88	)
Balance at September 30, 2016	$	252

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Goodwill and Intangible Assets

12 Months Ended

Sep. 30, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

4. GOODWILL AND INTANGIBLE ASSETS

Goodwill

The Company has goodwill balances of $2.9 million at September 30, 2016 and September 30, 2015, associated with the acquisition of IDchecker which occurred during 2015. For information regarding the acquisition of IDchecker, 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, 2016.

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 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	$	516	$	1,854
Customer relationships	6 years		970		211		759
Tradenames	5 years		230		60		170
Total intangible assets		$	3,570	$	787	$	2,783

Amortization expense related to acquired intangible assets was $0.6 million and $0.2 million for fiscal year ended September 30, 2016 and 2015, respectively. There was no amortization expense related to intangibles assets during fiscal 2014.

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
2017	$	601
2018		601
2019		601
2020		587
2021		393
Thereafter		—
	$	2,783

- 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, 2016

Equity [Abstract]

Stockholders' Equity

5. STOCKHOLDERS’ EQUITY

Common Stock

In June 2013, the Company sold 2,857,142 shares of its common stock at a price of $5.25 per share in an underwritten public offering (the “Offering”) and received $13.9 million in net proceeds, after deducting underwriting discounts and commissions and other offering expenses of $1.1 million. Under the terms of the underwriting agreement for the Offering, the Company granted the underwriter a 30-day option to purchase an additional 428,571 shares of its common stock to cover overallotments. The underwriter exercised its overallotment option during June 2013 and the closing of the sale of shares of the Company’s common stock pursuant to such option occurred during July 2013, resulting in $2.1 million in additional net proceeds to the Company, after deducting other offering expenses of $0.1 million.

Warrants

Historically, the Company has granted warrants to purchase its common stock to service providers and investors. As of September 30, 2014, there were warrants to purchase 6,667 shares of the Company’s common stock outstanding with an exercise price of $0.91 per share, subject to adjustment for stock splits, stock dividends and the like. These warrants expired in December 2014.

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, 2016 of 12.1% 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, 2016, 2015 and 2014.

No stock options were granted to employees during the fiscal year ended September 30, 2014. The fair value calculations for stock-based compensation awards to employees for the fiscal years ended September 30, 2016 and 2015 were based on the following assumptions:

	2016		2015
Risk-free interest rate	1.43% - 1.66%		1.29% - 1.66%
Expected life (years)	5.9		5.3
Expected volatility		83%		90%
Expected dividends	None		None

The following table summarizes stock-based compensation expense under ASC 718 for the fiscal years ended September 30, 2016, 2015 and 2014, which were allocated as follows (amounts shown in thousands):

	2016		2015		2014
Sales and marketing	$	1,122	$	743	$	824
Research and development		669		592		675
General and administrative		2,288		2,032		1,945
Acquisition-related costs and expenses		1,503		393		—
Stock-based compensation expense related to employee stock options included in operating expenses	$	5,582	$	3,760	$	3,444

The following table summarizes vested and unvested options, weighted average exercise price per share, weighted average remaining term and aggregate intrinsic value at September 30, 2016:

	Number of Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life (in Years)		Aggregate Intrinsic Value
Vested		2,107,825	$	4.31		5.55	$	9,491,803
Unvested		907,549	$	3.11		8.33		4,700,241
Total		3,015,374	$	3.95		6.39	$	14,192,044

The Company recognized $1.3 million, $2.2 million and $2.2 million in stock-based compensation expense related to outstanding stock options in the fiscal years ended September 30, 2016, 2015 and 2014, respectively. As of September 30, 2016, the Company had $2.0 million of unrecognized compensation expense related to outstanding stock options expected to be recognized over a weighted average period of approximately 2.3 years.

The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2016, 2015 and 2014:

	Number of Shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (in Years)
Outstanding, September 30, 2013		2,824,964		$	4.09		7.29
Granted		—		$	—
Exercised		(108,135	)	$	1.27
Cancelled		(382,503	)	$	4.77
Outstanding, September 30, 2014		2,334,326		$	4.11		5.46
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		7.15
Granted		98,500		$	4.51
Exercised		(661,663	)	$	2.67
Cancelled		(69,168	)	$	4.51
Outstanding, September 30, 2016		3,015,374		$	3.95		6.39

The total intrinsic value of options exercised during the fiscal years ended September 30, 2016, 2015 and 2014 was $3.3 million, $0.6 million and $0.5 million, respectively. The per-share weighted average fair value of options granted during the fiscal years ended September 30, 2016 and 2015 was $3.29 and $2.83, respectively. No stock options were granted to employees during the fiscal year ended September 30, 2014.

2012 Incentive Plan

In January 2012, the Company’s board of directors adopted the Mitek Systems, Inc. 2012 Incentive Plan (the “2012 Plan”), upon the recommendation of the compensation committee of the board of directors. The 2012 Plan was approved by the Company’s stockholders on February 22, 2012. On February 19, 2014, the Company’s stockholders approved an amendment to the 2012 Plan that increased the total number of shares of the Company’s common stock reserved for issuance thereunder from 2,000,000 shares to 4,000,000 shares, plus that number of shares of the Company’s common stock that would otherwise return to the available pool of unissued shares reserved for awards under the Company’s 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”). There were no awards granted under the Prior Plans after the approval of the 2012 Plan by the Company’s stockholders on February 22, 2012. Stock options granted under the Prior Plans that were outstanding at such date remain in effect until such options are exercised or expire.

The 2012 Plan authorizes the grant of stock options, stock appreciation rights, restricted stock, RSUs and cash awards. Stock options granted under the 2012 Plan may be either options intended to constitute incentive stock options or nonqualified stock options, in each case as determined by the compensation committee of the board of directors in accordance with the terms of the 2012 Plan. As of September 30, 2016, stock options to purchase 1,916,646 shares of the Company’s common stock and 1,401,169 RSUs were outstanding under the 2012 Plan, and 2,040,378 shares of the Company’s common stock were reserved for future grants.

The following table summarizes the number of stock options outstanding under the Prior Plans as of September 30, 2016:

2000 Stock Option Plan			6,262
2002 Stock Option Plan			36,750
2006 Stock Option Plan			43,000
2010 Stock Option Plan			1,012,716
Total stock options outstanding under the Prior Plans			1,098,728

Restricted Stock Units

In January 2011, the Company’s board of directors adopted, subject to stockholder approval, the Mitek Systems, Inc. Director Restricted Stock Unit Plan, as amended and restated (the “Director Plan”), reserving up to 1,000,000 shares of the Company’s common stock for the issuance of RSUs to both employee and non-employee members of the board of directors of the Company. On February 23, 2011, the Director Plan was approved by the Company’s stockholders at its annual meeting.

In addition, the Company has awarded RSUs to certain of its employees under the 2012 Plan. The RSUs vest in equal annual installments over four years.

The following table summarizes RSU activity in the fiscal years ended September 30, 2016, 2015 and 2014:

	Number of shares			Weighted- average fair value per share
Outstanding at September 30, 2013		692,504		$	4.85
Granted		625,139		$	4.83
Settled		(63,334	)	$	4.66
Cancelled		(153,006	)	$	5.03
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

The cost of a RSU 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 $2.7 million, $1.2 million and $1.3 million in stock-based compensation expense related to outstanding RSUs in the fiscal years ended September 30, 2016, 2015 and 2014, respectively. As of September 30, 2016, the Company had approximately $6.3 million of unrecognized compensation expense related to outstanding RSUs expected to be recognized over a weighted-average period of approximately 2.7 years.

Closing Shares

In connection with the Acquisition, 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 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. The Company recognized $1.3 million and $0.3 million in stock based compensation expense related to the Closing Shares for the years ended September 30, 2016 and 2015, respectively. As of September 30, 2016, the Company had $1.2 million of unrecognized compensation expense related to Closing Shares expected to be recognized over the remaining service period.

Earnout Shares

In addition to the cash payments made to the Sellers and the issuance of Closing Shares, in each case at the closing of the Acquisition, and subject to the achievement of certain revenue and net income targets for IDchecker for the nine-month period ended on September 30, 2015, and the twelve-month period ended September 30, 2016, the Company will issue to the Sellers up to an aggregate of $2,000,000 in shares of Common Stock (referred to elsewhere herein as the “Earnout Shares”) as follows (i) for the nine month period ending September 30, 2015, a maximum of $1,000,000 in Common Stock if certain revenue and net income targets (as set forth in the Share Purchase Agreement) are met; and (ii) for the twelve month period ending September 30, 2016, a maximum of $1,000,000 in Common Stock if certain revenue and net income targets (as set forth in the Share Purchase Agreement) are met.

Within 75 days after the last date of the respective earnout period (the “Earnout Determination Date”), the Company shall deliver to the Sellers a written statement of the calculation of the revenue and net income for the applicable earnout period. The number of shares issuable upon achievement of the revenue targets and net income targets, as applicable, will be calculated based on the volume weighted average closing price of the Common Stock over the 10 trading-day period ending on and including the applicable Earnout Determination Date. Earnout Shares issued, if any, shall vest and be eligible for resale such that 12.5% of the Earnout Shares shall vest and be released for resale on the six-month anniversary of the Earnout Determination Date applicable to such Earnout Shares and thereafter, the remaining 87.5% of the applicable Earnout Shares shall 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 and occurs over a period of 27 months from the applicable Earnout Determination Date.

As of the closing date of the Acquisition, the Company calculated the fair value of the Earnout Shares 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). This model was updated as of September 30, 2016 and will be updated and the respective fair value adjusted each reporting period based on the relevant facts and conditions at the reporting date. The Company recognized $0.3 million and $47,000 in stock based compensation expense related to the Earnout Shares for the fiscal years ended September 30, 2016 and 2015, respectively.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Income Taxes

12 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

Income Taxes

6. INCOME TAXES

For the fiscal years ended September 30, 2016, 2015 and 2014 the income tax (provision) benefit was as follows (amounts shown in thousands):

	2016			2015			2014
Federal—current	$	(129	)	$	(84	)	$	—
Federal—deferred		—			621			—
State—current		(16	)		(10	)		(2	)
State—deferred		—			13			—
Foreign—current		146			3			—
Total	$	1		$	543		$	(2	)

Significant components of the Company’s net deferred tax assets and liabilities as of September 30, 2016 and 2015 are as follows (amounts shown in thousands):

	2016			2015
Deferred tax assets:
Net operating loss carryforwards	$	7,095		$	9,825
Foreign net operating losses		327			258
Stock based compensation		2,898			2,333
AMT credit carryforwards		279			149
Other, net		320			305
Research credit carryforwards		44			44
Total deferred assets		10,963			12,914
Deferred tax liabilities:
Intangibles		(473	)		(603	)
Foreign deferred liabilities		(356	)		(415	)
Net deferred tax asset		10,134			11,896
Valuation allowance for net deferred tax assets		(10,163	)		(12,053	)
Net deferred tax liability	$	(29	)	$	(157	)

The Company has provided a valuation allowance against deferred tax assets recorded as of September 30, 2016 and 2015 due to uncertainties regarding the realization of such assets.

The net change in the total valuation allowance for the fiscal years ended September 30, 2016 and 2015 was a decrease in 2016 of $1.9 million and a decrease in 2015 of $0.9 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 projections for future taxable income, the Company has determined that it is more likely than not that the deferred tax assets will not be realized. Accordingly, the Company has recorded a valuation allowance to reduce deferred tax assets to zero. There can be no assurance that the Company will ever be able to realize the benefit of some or all of the federal and state loss carryforwards or the credit carryforwards, either due to ongoing operating losses or due to ownership changes, which limit the usefulness of the loss carryforwards.

As of September 30, 2016, the Company has available net operating loss carryforwards of $37.4 million for federal income tax purposes, which will start to expire in 2018. The net operating loss carryforwards for state purposes are $31.7 million and will begin to expire in 2017. Included in these amounts are federal and state net operating losses of $18.8 million attributable to stock option deductions of which the tax benefit will be credited to equity when realized. As of September 30, 2016, the Company has available federal research and development credit carryforwards of $29,000 and alternative minimum tax credit carryforwards of $0.3 million. The federal research and development credits will start to expire in 2023. As of September 30, 2016, the Company has available California research and development credit carryforwards of $14,000, which do not expire.

The Company’s ability to use its net operating loss and research and development credit carryforwards may be substantially limited due to ownership change limitations that may have occurred or that could occur in the future, as required by Section 382 of the Internal Revenue Code of 1986, as amended (“Section 382”), as well as similar state provisions. The Company has not completed a study to assess whether an ownership change has occurred or whether there have been multiple ownership changes since the Company became a “loss corporation” as defined in Section 382. Due to the existence of the valuation allowance, it is not expected that any possible limitation will have an impact on the results of operations or financial position of the Company.

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 years ended September 30, 2016, 2015 and 2014 (amounts shown in thousands):

	2016			2015			2014
Amount computed using statutory rate	$	(666	)	$	(674	)	$	1,798
Net change in valuation allowance for net deferred tax assets		1,889			1,619			(1,677	)
AMT and other		(148	)		151			—
Foreign rate differential		(70	)		(1	)		—
Non-deductible items		(1,136	)		(182	)		(411	)
State income tax		(15	)		(370	)		288
Foreign net operating loss		147			—			—
Income tax (provision) benefit	$	1		$	543		$	(2	)

The Company files income tax returns in the U.S. federal jurisdiction and various state jurisdictions. Because the Company is carrying forward federal and state net operating losses from 1997 and 2002, respectively, the Company is subject to U.S. federal and state income tax examinations by tax authorities for all years since 1997 and 2002, as the case may be. The Company does not have any uncertain tax positions. As of September 30, 2016, no accrued interest or penalties are recorded in the consolidated financial statements.

Commitments and Contingencies

12 Months Ended

Sep. 30, 2016

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

7. COMMITMENTS AND CONTINGENCIES

Legal Matters

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 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 U.S. District Court for the District of Delaware. 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.

The Company is currently controlling the defense of such claims and have taken actions to defend the RMII Lawsuits, as more fully described above. The Company believes that RMII’s claims are without merit and have vigorously defended against those claims. The Company does not believe that the results of the RMII Lawsuits will have a material adverse effect on the Company’s financial condition or results of operations.

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. During the fiscal year ended September 30, 2015, the Company implemented a company match to the plan. As of September 30, 2016 and 2015, the Company had $63,000 and $42,000 accrued for the 401(k) match, respectively. During the fiscal years ended September 30, 2014, the Company did not match contributions to the plan.

Facility Lease

The Company’s principal executive offices, as well as its research and development facility, are located in approximately 28,354 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, UK. The term of this lease continues through May 31, 2017. The annual base rent under this lease is approximately £65,000 per year.

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

Years ending September 30:
2017	$	499
2018		755
2019		776
2020		469
2021		—
Thereafter		—
Total	$	2,499

Rent expense for the Company’s operating leases for its facilities for the years ended September 30, 2016, 2015 and 2014 totaled $0.3 million, $0.4 million and $0.4 million, respectively.

Revenue and Vendor Concentrations	12 Months Ended
Revenue and Vendor Concentrations	Sep. 30, 2016
Risks And Uncertainties [Abstract]
Revenue and Vendor Concentrations	8. REVENUE AND VENDOR CONCENTRATIONS Revenue Concentration For the fiscal year ended September 30, 2016, the Company derived revenue of $6.3 million, or 18% of the Company’s total revenue, from one customer, compared to revenue of $6.3 million, or 25% of the Company’s total revenue, from one customer for the fiscal year ended September 30, 2015. For the fiscal year ended September 30, 2014, the Company derived revenue of $5.7 million or 30% 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 $1.0 million, $1.1 million and $1.4 million at September 30, 2016, 2015 and 2014, 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 15%, 5% and 4% of the Company’s total revenue for the fiscal years ended September 30, 2016, 2015 and 2014, 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, 2016, 2015 and 2014, 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, 2016

Quarterly Financial Information Disclosure [Abstract]

Quarterly Information (Unaudited)

9. QUARTERLY INFORMATION (UNAUDITED)

The following table sets forth selected quarterly financial data for 2016, 2015 and 2014 (shown in thousands except share data):

	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 (expense), 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		31,094,417			31,325,577			31,823,386		32,086,223
Diluted income (loss) per share		(0.01	)		0.02			0.02		0.03
Shares used in calculating net income (loss) per share - diluted		31,094,417			33,133,920			34,531,964		34,859,861

	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 (loss)		134			486		310		962
Other income (expense), net		15			21		30		25
Income tax benefit (provision)		(3	)		—		578		(32	)
Net income (loss)		146			507		918		955
Net income (loss) per share:
Basic income (loss) per share		0.00			0.02		0.03		0.03
Shares used in calculating net income (loss) per share - basic		30,618,097			30,697,391		30,764,694		30,969,157
Diluted income (loss) per share		0.00			0.02		0.03		0.03
Shares used in calculating net income (loss) per share - diluted		31,173,815			31,321,259		31,645,696		31,664,178

	2014 (by quarter)
	1			2			3			4
Revenue	$	4,463		$	4,484		$	4,660		$	5,544
Cost of revenue		571			450			608			520
Operating expenses		5,373			6,246			5,702			5,089
Operating income (loss)		(1,481	)		(2,212	)		(1,650	)		(65	)
Other income (expense), net		13			19			17			67
Income tax benefit (provision)		—			—			—			—
Net income (loss)		(1,468	)		(2,193	)		(1,633	)		2
Net income (loss) per share:
Basic income (loss) per share		(0.05	)		(0.07	)		(0.05	)		0.00
Shares used in calculating net income (loss) per share - basic		30,402,397			30,453,455			30,481,168			30,510,587
Diluted income (loss) per share		(0.05	)		(0.07	)		(0.05	)		0.00
Shares used in calculating net income (loss) per share - diluted		30,402,397			30,453,455			30,481,168			31,022,148

Nature of Operations and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

Nature of Operations

Mitek Systems, Inc. (the “Company”) develops, markets and sells proprietary mobile capture and identity verification software solutions for enterprise customers.

Basis of Presentation

Principles of Consolidation

Foreign Currency

Use of Estimates

Goodwill and Purchased Intangible Assets

Net Income (Loss) Per Share

At September 30, 2016, 2015 and 2014, the following potentially dilutive common shares were excluded from the net income (loss) per share calculation, as they would have been antidilutive:

	2016		2015		2014
Stock options		1,258,844		2,202,844		2,334,326
Warrants		—		—		6,667
Restricted stock units		623,883		287,147		1,101,303
IDchecker shares		349,239		63,037		—
Total potentially dilutive common shares outstanding		2,231,966		2,553,028		3,442,296

The computation of basic and diluted net income (loss) per share for the fiscal years ended September 30, 2016, 2015 and 2014 is as follows (amounts in thousands, except share data):

	2016		2015		2014
Net income (loss)	$	1,959	$	2,526	$	(5,292	)
Weighted-average common shares and share equivalents outstanding—basic		31,586,535		30,790,258		30,466,063
Dilutive potential common stock equivalents		2,231,966		689,983		—
Weighted-average common shares and share equivalents outstanding—diluted		33,818,501		31,480,241		30,466,063
Net income (loss) per share:
Basic	$	0.06	$	0.08	$	(0.17	)
Diluted	$	0.06	$	0.08	$	(0.17	)

Revenue Recognition

Cash and Cash Equivalents

Investments

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

Fair Value Measurements

Accounts Receivable and Allowance for Doubtful Accounts

Deferred Maintenance Fees

Property and Equipment

Property and equipment are carried at cost. The following is a summary of property and equipment as of September 30, 2016 and 2015 (amounts shown in thousands):

	2016			2015
Property and equipment—at cost:
Equipment	$	1,476		$	1,281
Furniture and fixtures		249			229
Leasehold improvements		1,018			995
		2,743			2,505
Less: accumulated depreciation and amortization		(2,303	)		(1,530	)
Total property and equipment, net	$	440		$	975

Long-Lived Assets

Capitalized Software Development Costs

Stock-Based Compensation

Advertising Expense

Advertising costs are expensed as incurred and totaled $0.2 million, $0.2 million and $0.1 million during the fiscal years ended September 30, 2016, 2015 and 2014, respectively.

Research and Development

Research and development costs are expensed in the period incurred.

Leases

Segment Reporting

Comprehensive Loss

	2016			2015		2014
Net income (loss)	$	1,959		$	2,526	$	(5,292	)
Other comprehensive income (loss):
Foreign currency translation adjustment		(46	)		—		—
Change in unrealized gains (losses) on marketable securities		7			5		(10	)
Total comprehensive income (loss)	$	1,920		$	2,531	$	(5,302	)

Included on the balance sheet at September 30, 2016 is an accumulated other comprehensive loss of $42,000, compared to an accumulated other comprehensive loss of $3,000 at September 30, 2015.

Recent Accounting Pronouncements

Nature of Operations and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

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

At September 30, 2016, 2015 and 2014, the following potentially dilutive common shares were excluded from the net income (loss) per share calculation, as they would have been antidilutive:

	2016		2015		2014
Stock options		1,258,844		2,202,844		2,334,326
Warrants		—		—		6,667
Restricted stock units		623,883		287,147		1,101,303
IDchecker shares		349,239		63,037		—
Total potentially dilutive common shares outstanding		2,231,966		2,553,028		3,442,296

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

The computation of basic and diluted net income (loss) per share for the fiscal years ended September 30, 2016, 2015 and 2014 is as follows (amounts in thousands, except share data):

	2016		2015		2014
Net income (loss)	$	1,959	$	2,526	$	(5,292	)
Weighted-average common shares and share equivalents outstanding—basic		31,586,535		30,790,258		30,466,063
Dilutive potential common stock equivalents		2,231,966		689,983		—
Weighted-average common shares and share equivalents outstanding—diluted		33,818,501		31,480,241		30,466,063
Net income (loss) per share:
Basic	$	0.06	$	0.08	$	(0.17	)
Diluted	$	0.06	$	0.08	$	(0.17	)

Summary of Property and Equipment

The following is a summary of property and equipment as of September 30, 2016 and 2015 (amounts shown in thousands):

	2016			2015
Property and equipment—at cost:
Equipment	$	1,476		$	1,281
Furniture and fixtures		249			229
Leasehold improvements		1,018			995
		2,743			2,505
Less: accumulated depreciation and amortization		(2,303	)		(1,530	)
Total property and equipment, net	$	440		$	975

Components of Comprehensive Loss

The following table summarizes the components of comprehensive loss for the fiscal years ended September 30, 2016, 2015 and 2014 (amounts shown in thousands):

	2016			2015		2014
Net income (loss)	$	1,959		$	2,526	$	(5,292	)
Other comprehensive income (loss):
Foreign currency translation adjustment		(46	)		—		—
Change in unrealized gains (losses) on marketable securities		7			5		(10	)
Total comprehensive income (loss)	$	1,920		$	2,531	$	(5,302	)

Business Combination (Tables)

12 Months Ended

Sep. 30, 2016

IDchecker [Member]

Business Acquisition [Line Items]

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 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	$	2,873
Effect of movements in exchange rates		(10	)
Goodwill	$	2,863

Investments (Tables)

12 Months Ended

Sep. 30, 2016

Summary of Investments by Type of Security

The following table summarizes investments by security type as of September 30, 2016 and 2015 (amounts shown in thousands):

	September 30, 2016
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
US Treasury	$	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

	September 30, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
Corporate debt securities, short-term	$	23,924	$	3	$	(6	)	$	23,921
Total	$	23,924	$	3	$	(6	)	$	23,921

Summary of Fair Value of Investments Measured on Recurring Basis

	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:
US Treasury	$	12,915	$	12,915	$	—	$	—
Corporate debt securities
Financial		3,963		—		3,963		—
Industrial		4,445		—		4,445		—
Commercial paper
Industrial		697		—		697		—
Financial		2,843		—		2,843		—
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

September 30, 2015:
Assets:
Short-term investments:
Corporate debt securities
Financial	$	10,308	$	—	$	10,308	$	—
Industrial		9,665		—		9,665		—
Utility		1,802		—		1,802		—
Commercial paper
Industrial		1,448		—		1,448		—
Financial		698		—		698		—
Total assets at fair value	$	23,921	$	—	$	23,921	$	—
Liabilities:
Acquisition-related contingent consideration		47		—		—		47
Total liabilities at fair value	$	47	$	—	$	—	$	47

Contingent Consideration [Member]

Summary of Acquisition-related Contingent Consideration Measured at Fair Value

Balance at September 30, 2015	$	47
Expenses recorded due to changes in fair value		293
Issuance of common stock		(88	)
Balance at September 30, 2016	$	252

Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

	Weighted Average Amortization Period	Cost		Accumulated Amortization		Net
Completed technologies	6 years	$	2,370	$	516	$	1,854
Customer relationships	6 years		970		211		759
Tradenames	5 years		230		60		170
Total intangible assets		$	3,570	$	787	$	2,783

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
2017	$	601
2018		601
2019		601
2020		587
2021		393
Thereafter		—
	$	2,783

Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2016

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, 2016 and 2015 were based on the following assumptions:

	2016		2015
Risk-free interest rate	1.43% - 1.66%		1.29% - 1.66%
Expected life (years)	5.9		5.3
Expected volatility		83%		90%
Expected dividends	None		None

Stock-Based Compensation Expense Related to Stock Options and RSUs

	2016		2015		2014
Sales and marketing	$	1,122	$	743	$	824
Research and development		669		592		675
General and administrative		2,288		2,032		1,945
Acquisition-related costs and expenses		1,503		393		—
Stock-based compensation expense related to employee stock options included in operating expenses	$	5,582	$	3,760	$	3,444

Summary of Vested and Unvested Options, Weighted Average Exercise Price per Share, Weighted Average Remaining Term and Aggregate Intrinsic Value

The following table summarizes vested and unvested options, weighted average exercise price per share, weighted average remaining term and aggregate intrinsic value at September 30, 2016:

	Number of Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life (in Years)		Aggregate Intrinsic Value
Vested		2,107,825	$	4.31		5.55	$	9,491,803
Unvested		907,549	$	3.11		8.33		4,700,241
Total		3,015,374	$	3.95		6.39	$	14,192,044

Stock Option Activity

The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2016, 2015 and 2014:

	Number of Shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (in Years)
Outstanding, September 30, 2013		2,824,964		$	4.09		7.29
Granted		—		$	—
Exercised		(108,135	)	$	1.27
Cancelled		(382,503	)	$	4.77
Outstanding, September 30, 2014		2,334,326		$	4.11		5.46
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		7.15
Granted		98,500		$	4.51
Exercised		(661,663	)	$	2.67
Cancelled		(69,168	)	$	4.51
Outstanding, September 30, 2016		3,015,374		$	3.95		6.39

Number of Stock Options Outstanding under Prior Plans

The following table summarizes the number of stock options outstanding under the Prior Plans as of September 30, 2016:

2000 Stock Option Plan			6,262
2002 Stock Option Plan			36,750
2006 Stock Option Plan			43,000
2010 Stock Option Plan			1,012,716
Total stock options outstanding under the Prior Plans			1,098,728

RSU Activity

The following table summarizes RSU activity in the fiscal years ended September 30, 2016, 2015 and 2014:

	Number of shares			Weighted- average fair value per share
Outstanding at September 30, 2013		692,504		$	4.85
Granted		625,139		$	4.83
Settled		(63,334	)	$	4.66
Cancelled		(153,006	)	$	5.03
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

Income Taxes (Tables)

12 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

Income Tax (Provision) Benefit

For the fiscal years ended September 30, 2016, 2015 and 2014 the income tax (provision) benefit was as follows (amounts shown in thousands):

	2016			2015			2014
Federal—current	$	(129	)	$	(84	)	$	—
Federal—deferred		—			621			—
State—current		(16	)		(10	)		(2	)
State—deferred		—			13			—
Foreign—current		146			3			—
Total	$	1		$	543		$	(2	)

Company's Net Deferred Tax Assets and Liabilities

Significant components of the Company’s net deferred tax assets and liabilities as of September 30, 2016 and 2015 are as follows (amounts shown in thousands):

	2016			2015
Deferred tax assets:
Net operating loss carryforwards	$	7,095		$	9,825
Foreign net operating losses		327			258
Stock based compensation		2,898			2,333
AMT credit carryforwards		279			149
Other, net		320			305
Research credit carryforwards		44			44
Total deferred assets		10,963			12,914
Deferred tax liabilities:
Intangibles		(473	)		(603	)
Foreign deferred liabilities		(356	)		(415	)
Net deferred tax asset		10,134			11,896
Valuation allowance for net deferred tax assets		(10,163	)		(12,053	)
Net deferred tax liability	$	(29	)	$	(157	)

Income Taxes Computed Using Federal Income Tax Rate

	2016			2015			2014
Amount computed using statutory rate	$	(666	)	$	(674	)	$	1,798
Net change in valuation allowance for net deferred tax assets		1,889			1,619			(1,677	)
AMT and other		(148	)		151			—
Foreign rate differential		(70	)		(1	)		—
Non-deductible items		(1,136	)		(182	)		(411	)
State income tax		(15	)		(370	)		288
Foreign net operating loss		147			—			—
Income tax (provision) benefit	$	1		$	543		$	(2	)

Commitments and Contingencies (Tables)

12 Months Ended

Sep. 30, 2016

Commitments And Contingencies Disclosure [Abstract]

Future Annual Minimum Rental Payments Payable

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

Years ending September 30:
2017	$	499
2018		755
2019		776
2020		469
2021		—
Thereafter		—
Total	$	2,499

Quarterly Information (Unaudited) (Tables)

12 Months Ended

Sep. 30, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Data

The following table sets forth selected quarterly financial data for 2016, 2015 and 2014 (shown in thousands except share data):

	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 (expense), 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		31,094,417			31,325,577			31,823,386		32,086,223
Diluted income (loss) per share		(0.01	)		0.02			0.02		0.03
Shares used in calculating net income (loss) per share - diluted		31,094,417			33,133,920			34,531,964		34,859,861

	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 (loss)		134			486		310		962
Other income (expense), net		15			21		30		25
Income tax benefit (provision)		(3	)		—		578		(32	)
Net income (loss)		146			507		918		955
Net income (loss) per share:
Basic income (loss) per share		0.00			0.02		0.03		0.03
Shares used in calculating net income (loss) per share - basic		30,618,097			30,697,391		30,764,694		30,969,157
Diluted income (loss) per share		0.00			0.02		0.03		0.03
Shares used in calculating net income (loss) per share - diluted		31,173,815			31,321,259		31,645,696		31,664,178

	2014 (by quarter)
	1			2			3			4
Revenue	$	4,463		$	4,484		$	4,660		$	5,544
Cost of revenue		571			450			608			520
Operating expenses		5,373			6,246			5,702			5,089
Operating income (loss)		(1,481	)		(2,212	)		(1,650	)		(65	)
Other income (expense), net		13			19			17			67
Income tax benefit (provision)		—			—			—			—
Net income (loss)		(1,468	)		(2,193	)		(1,633	)		2
Net income (loss) per share:
Basic income (loss) per share		(0.05	)		(0.07	)		(0.05	)		0.00
Shares used in calculating net income (loss) per share - basic		30,402,397			30,453,455			30,481,168			30,510,587
Diluted income (loss) per share		(0.05	)		(0.07	)		(0.05	)		0.00
Shares used in calculating net income (loss) per share - diluted		30,402,397			30,453,455			30,481,168			31,022,148

Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($) Patents Institution	Sep. 30, 2016 USD ($) Patents Institution Reporting Segment	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of patents granted \| Patents	27	27
Number of patent applications pending \| Patents	16	16
Number of financial institutions signed agreements to deploy mobile deposit \| Institution	5,400	5,400
Number of top U.S. retail banks that deployed mobile deposit \| Institution	50	50
Foreign currency translation adjustment		$ 46,000	$ 0	$ 0
Impairment of goodwill and intangibles	$ 0
Number of reporting unit \| Reporting		1
Other-than-temporary impairment charges recognized		$ 0	0	0
Allowance for doubtful accounts		0	0
Allowance for doubtful accounts receivable	35,000	$ 35,000	13,000
Deferred software maintenance fees amortization period		1 year
Depreciation and amortization of property and equipment total		$ 800,000	400,000	500,000
Fixed assets acquired under capital leases	2,743,000	2,743,000	2,505,000
Total repairs and maintenance expenses		200,000	100,000	100,000
Impairment charges		0	0	0
Software development costs capitalized	0	$ 0	0
Tax benefit is measured based on the largest benefit		Greater than 50%
Advertising costs		$ 200,000	200,000	100,000
Number of operating segment \| Segment		1
Accumulated other comprehensive loss	42,000	$ 42,000	3,000
ASU No 2015-17 [Member] \| Early adoption [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
New accounting guidance, no adjustment made to prior periods		true
Minimum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives		3 years
Maximum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives		5 years
Assets acquired under capital leases [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Fixed assets acquired under capital leases	100,000	$ 100,000	100,000
Equipment [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Fixed assets acquired under capital leases	1,476,000	1,476,000	1,281,000
Depreciation expense under capital lease		19,000	19,000	$ 19,000
Accumulated depreciation	$ 100,000	$ 100,000	$ 100,000

Nature of Operations and Summary of Significant Accounting Policies - Potentially Dilutive Common Shares Excluded from Net Income (Loss) per Share Calculation (Detail) - shares	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding	2,231,966	2,553,028	3,442,296
Stock options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding	1,258,844	2,202,844	2,334,326
Warrants [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding			6,667
Restricted stock units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding	623,883	287,147	1,101,303
IDchecker [Member] \| Share Purchase Agreement [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding	349,239	63,037

Nature of Operations and Summary of Significant Accounting Policies - Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	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, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share Basic And Diluted [Line Items]
Net income (loss)	$ 960	$ 739	$ 582	$ (322)	$ 955	$ 918	$ 507	$ 146	$ 2	$ (1,633)	$ (2,193)	$ (1,468)	$ 1,959	$ 2,526	$ (5,292)
Weighted-average common shares and share equivalents outstanding—basic	32,086,223	31,823,386	31,325,577	31,094,417	30,969,157	30,764,694	30,697,391	30,618,097	30,510,587	30,481,168	30,453,455	30,402,397	31,586,535	30,790,258	30,466,063
Weighted-average common shares and share equivalents outstanding—diluted	34,859,861	34,531,964	33,133,920	31,094,417	31,664,178	31,645,696	31,321,259	31,173,815	31,022,148	30,481,168	30,453,455	30,402,397	33,818,501	31,480,241	30,466,063
Net income (loss) per share - Basic	$ 0.03	$ 0.02	$ 0.02	$ (0.01)	$ 0.03	$ 0.03	$ 0.02	$ 0.00	$ 0.00	$ (0.05)	$ (0.07)	$ (0.05)	$ 0.06	$ 0.08	$ (0.17)
Net income (loss) per share - Diluted	$ 0.03	$ 0.02	$ 0.02	$ (0.01)	$ 0.03	$ 0.03	$ 0.02	$ 0.00	$ 0.00	$ (0.05)	$ (0.07)	$ (0.05)	$ 0.06	$ 0.08	$ (0.17)
Stock options [Member]
Earnings Per Share Basic And Diluted [Line Items]
Dilutive potential common stock equivalents													2,231,966	689,983

Nature of Operations and Summary of Significant Accounting Policies - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 2,743	$ 2,505
Less: accumulated depreciation and amortization	(2,303)	(1,530)
Total property and equipment, net	440	975
Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,476	1,281
Furniture and fixtures [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	249	229
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,018	$ 995

Nature of Operations and Summary of Significant Accounting Policies - Components of Comprehensive Loss (Detail) - USD ($)	3 Months Ended												12 Months Ended
	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, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Comprehensive Income Net Of Tax [Abstract]
Net income (loss)	$ 960,000	$ 739,000	$ 582,000	$ (322,000)	$ 955,000	$ 918,000	$ 507,000	$ 146,000	$ 2,000	$ (1,633,000)	$ (2,193,000)	$ (1,468,000)	$ 1,959,000	$ 2,526,000	$ (5,292,000)
Other comprehensive income (loss):
Foreign currency translation adjustment													(46,000)	0	0
Change in unrealized gain (loss) on investments													7,000	5,000	(10,000)
Total comprehensive income (loss)													$ 1,920,000	$ 2,531,000	$ (5,302,000)

Business Combination - Additional Information (Detail) - USD ($)		12 Months Ended
	Jun. 17, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Common stock, par value		$ 0.001	$ 0.001
Goodwill		$ 2,863,000	$ 2,873,000
Maximum [Member]
Business Acquisition [Line Items]
Business combination, escrow fund period	24 months
IDchecker [Member]
Business Acquisition [Line Items]
Acquisition date	Jun. 17, 2015
Total consideration paid	$ 5,900,000
Payments to acquire businesses, gross	5,600,000
Common stock issued during acquisition, value	$ 2,700,000
Common stock, par value	$ 0.001
Business combination consideration transfer, promissory notes	$ 300,000
Cash payment to escrow fund related to business acquisition	$ 1,800,000
Business combination, percentage of closing shares in escrow fund	20.00%
Goodwill	$ 2,863,000
IDchecker [Member] \| Closing Shares [Member]
Business Acquisition [Line Items]
Common stock issued during acquisition, share	712,790
IDchecker [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Business combination, earnout shares	$ 2,000,000	$ 2,000,000

Business Combination - Schedule of Estimated Fair Values of Assets acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Jun. 17, 2015
Business Acquisition [Line Items]
Goodwill	$ 2,863	$ 2,873
IDchecker [Member]
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			(10)
Goodwill			$ 2,863

Investments - Summary of Investments by Type of Security (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Schedule Of Available For Sale Securities [Line Items]
Cost	$ 26,810	$ 23,924
Gross Unrealized Gains	11	3
Gross Unrealized Losses	(6)	(6)
Fair Market Value	26,815	23,921
US Treasury [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	12,907
Gross Unrealized Gains	8
Fair Market Value	12,915
Corporate debt securities [Member] \| Short-term [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	11,949	23,924
Gross Unrealized Gains	2	3
Gross Unrealized Losses	(3)	(6)
Fair Market Value	11,948	$ 23,921
Corporate debt securities [Member] \| Long-term [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	1,954
Gross Unrealized Gains	1
Gross Unrealized Losses	(3)
Fair Market Value	$ 1,952

Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	$ 26,815	$ 23,921
Acquisition-related contingent consideration	252	47
Total liabilities at fair value	252	47
Short-term investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	24,863
Short-term investments [Member] \| US Treasury [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	12,915
Short-term investments [Member] \| Corporate debt securities [Member] \| Financial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	3,963	10,308
Short-term investments [Member] \| Corporate debt securities [Member] \| Industrial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	4,445	9,665
Short-term investments [Member] \| Corporate debt securities [Member] \| Utility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value		1,802
Short-term investments [Member] \| Commercial paper [Member] \| Financial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	2,843	698
Short-term investments [Member] \| Commercial paper [Member] \| Industrial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	697	1,448
Long-term [Member] \| Corporate debt securities [Member] \| Financial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	502
Long-term [Member] \| Corporate debt securities [Member] \| Industrial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	1,450
Quoted Prices in Active Markets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	12,915
Quoted Prices in Active Markets (Level 1) [Member] \| Short-term investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	12,915
Quoted Prices in Active Markets (Level 1) [Member] \| Short-term investments [Member] \| US Treasury [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	12,915
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	13,900	23,921
Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	11,948
Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member] \| Corporate debt securities [Member] \| Financial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	3,963	10,308
Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member] \| Corporate debt securities [Member] \| Industrial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	4,445	9,665
Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member] \| Corporate debt securities [Member] \| Utility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value		1,802
Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member] \| Commercial paper [Member] \| Financial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	2,843	698
Significant Other Observable Inputs (Level 2) [Member] \| Short-term investments [Member] \| Commercial paper [Member] \| Industrial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	697	1,448
Significant Other Observable Inputs (Level 2) [Member] \| Long-term [Member] \| Corporate debt securities [Member] \| Financial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	502
Significant Other Observable Inputs (Level 2) [Member] \| Long-term [Member] \| Corporate debt securities [Member] \| Industrial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	1,450
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	252	47
Total liabilities at fair value	$ 252	$ 47

Investments - Summary of Acquisition-related Contingent Consideration Measured at Fair Value (Detail) - Contingent Consideration [Member] $ in Thousands	12 Months Ended
	Sep. 30, 2016 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at September 30, 2015	$ 47
Expenses recorded due to changes in fair value	293
Issuance of common stock	(88)
Balance at September 30, 2016	$ 252

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Goodwill	$ 2,863,000	$ 2,873,000
Goodwill impairment	0
Amortization of intangible assets	$ 598,000	$ 172,000	$ 0
Minimum [Member]
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets	5 years
Maximum [Member]
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, 2016	Sep. 30, 2015
Indefinite Lived Intangible Assets By Major Class [Line Items]
Cost	$ 3,570
Accumulated Amortization	787
Net	$ 2,783	$ 3,397
Completed technologies [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	6 years
Cost	$ 2,370
Accumulated Amortization	516
Net	$ 1,854
Customer relationships [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	6 years
Cost	$ 970
Accumulated Amortization	211
Net	$ 759
Tradenames [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	5 years
Cost	$ 230
Accumulated Amortization	60
Net	$ 170

Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
2017	$ 601
2018	601
2019	601
2020	587
2021	393
Net	$ 2,783	$ 3,397

Stockholders' Equity - Additional Information (Detail) - USD ($)		1 Months Ended		12 Months Ended
	Jun. 17, 2015	Jul. 31, 2013	Jun. 30, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Feb. 19, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares sold				32,781,704	31,721,114
Number of warrants outstanding						6,667
Common stock issued exercise price						$ 0.91
Warrants expired date						2014-12
Estimated average forfeiture rate				12.10%
Tax benefits received related to stock option exercises				$ 0	$ 0	$ 0
Recognized compensation expense				5,582,000	3,760,000	3,444,000
Unrecognized compensation expense				2,000,000
Total intrinsic value of options exercised				$ 3,300,000	$ 600,000	$ 500,000
Weighted average fair value of options granted				$ 3.29	$ 2.83
Number of options granted to employees				98,500	1,927,500	0
Purchase of common stock				3,015,374	3,647,705	2,334,326		2,824,964
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 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense				$ 300,000	$ 47,000
Vesting period of shares received				27 months
Common stock trading period				10 days
Earnout Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Delivery period of written statement of calculation of revenue and net income for earnout period				75 days
IDchecker [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business combination, earnout shares	$ 2,000,000			$ 2,000,000
IDchecker [Member] \| Maximum [Member] \| 1/1/15-9/30/15 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business combination, earnout shares				1,000,000
IDchecker [Member] \| Maximum [Member] \| 10/1/15-9/30/16 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business combination, earnout shares				1,000,000
IDchecker [Member] \| Closing Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense				1,300,000	300,000
Vesting period of shares received	27 months
Common stock issued during acquisition, share	712,790
Unrecognized compensation expense				$ 1,200,000
2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance							4,000,000
Purchase of common stock				1,916,646
Number of common stock reserved for future grants				2,040,378
Scenario, Previously Reported [Member] \| 2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance							2,000,000
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense				$ 1,300,000	2,200,000	$ 2,200,000
Weighted average period for unrecognized compensation expense expected to be recognized				2 years 3 months 18 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense				$ 2,700,000	$ 1,200,000	$ 1,300,000
Weighted average period for unrecognized compensation expense expected to be recognized				2 years 8 months 12 days
Common stock reserved for issuance				1,000,000
Options outstanding				2,046,169	802,917	1,101,303		692,504
Vesting period of shares received				4 years
Unrecognized compensation expense				$ 6,300,000
Restricted Stock Units (RSUs) [Member] \| 2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding				1,401,169
IPO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares sold			2,857,142
Common stock, price per share			$ 5.25
Net proceeds from issuance of common stock			$ 13,900,000
Underwriting discounts and commissions and other offering expenses			$ 1,100,000
Other offering expenses		$ 100,000
Overallotment option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares of common stock to cover over allotments			428,571
Underwriter option exercised		$ 2,100,000

Stockholders' Equity - Fair Value Calculations for Stock-Based Compensation Awards (Detail)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Equity [Abstract]
Risk-free interest rate, Minimum	1.43%	1.29%
Risk-free interest rate, Maximum	1.66%	1.66%
Expected life (years)	5 years 10 months 24 days	5 years 3 months 18 days
Expected volatility	83.00%	90.00%
Expected dividends	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, 2016	Sep. 30, 2015	Sep. 30, 2014
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	$ 5,582	$ 3,760	$ 3,444
Acquisition-related costs and expenses [Member]
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	1,503	393
Sales and Marketing [Member]
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	1,122	743	824
Research and Development [Member]
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	669	592	675
General and Administrative [Member]
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	$ 2,288	$ 2,032	$ 1,945

Stockholders' Equity - Summary of Vested and Unvested Options, Weighted Average Exercise Price per Share, Weighted Average Remaining Term and Aggregate Intrinsic Value (Detail)	12 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Vested \| shares	2,107,825
Number of Shares, Unvested \| shares	907,549
Number of Shares, Total \| shares	3,015,374
Weighted Average Exercise Price Per Share, Vested \| $ / shares	$ 4.31
Weighted Average Exercise Price Per Share, Unvested \| $ / shares	3.11
Weighted Average Exercise Price Per Share, Total \| $ / shares	$ 3.95
Weighted Average Remaining Contractual Life, Vested	5 years 6 months 18 days
Weighted Average Remaining Contractual Life, Unvested	8 years 3 months 29 days
Weighted Average Remaining Contractual Life, Total	6 years 4 months 21 days
Aggregate Intrinsic Value, Vested \| $	$ 9,491,803
Aggregate Intrinsic Value, Unvested \| $	4,700,241
Aggregate Intrinsic Value, Total \| $	$ 14,192,044

Stockholders' Equity - Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Beginning balance	3,647,705	2,334,326	2,824,964
Number of Shares, Granted	98,500	1,927,500	0
Number of Shares, Exercised	(661,663)	(232,203)	(108,135)
Number of Shares, Cancelled	(69,168)	(381,918)	(382,503)
Number of Shares, Ending balance	3,015,374	3,647,705	2,334,326	2,824,964
Weighted Average Exercise Price Per Share, Beginning balance	$ 3.70	$ 4.11	$ 4.09
Weighted Average Exercise Price Per Share, Granted	4.51	2.92
Weighted Average Exercise Price Per Share, Exercised	2.67	1.06	1.27
Weighted Average Exercise Price Per Share, Cancelled	4.51	3.85	4.77
Weighted Average Exercise Price Per Share, Ending balance	$ 3.95	$ 3.70	$ 4.11	$ 4.09
Weighted Average Remaining Contractual Term (in Years)	6 years 4 months 21 days	7 years 1 month 24 days	5 years 5 months 16 days	7 years 3 months 15 days

Stockholders' Equity - Number of Stock Options Outstanding under Prior Plans (Detail)	Sep. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	1,098,728
2000 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	6,262
2002 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	36,750
2006 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	43,000
2010 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	1,012,716

Stockholders' Equity - RSU Activity (Detail) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning balance	802,917	1,101,303	692,504
Number of Shares, Granted	1,536,000	104,000	625,139
Number of Shares, Settled	(261,621)	(255,041)	(63,334)
Number of Shares, Cancelled	(31,127)	(147,345)	(153,006)
Number of Shares, Ending balance	2,046,169	802,917	1,101,303
Weighted Average Fair Value Per Share, Beginning balance	$ 4.49	$ 4.71	$ 4.85
Weighted Average Fair Value Per Share, Granted	4.82	2.29	4.83
Weighted Average Fair Value Per Share, Settled	4.77	2.96	4.66
Weighted Average Fair Value Per Share, Cancelled	4.19	3.54	5.03
Weighted Average Fair Value Per Share, Ending balance	$ 4.90	$ 4.49	$ 4.71

Income Taxes - Income Tax (Provision) Benefit (Detail) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Federal—current							$ (129)	$ (84)
Federal—deferred								621
State—current							(16)	(10)	$ (2)
State—deferred								13
Foreign—current							146	3
Income tax (provision) benefit	$ 96	$ (79)	$ (16)	$ (32)	$ 578	$ (3)	$ 1	$ 543	$ (2)

Income Taxes - Company's Net Deferred Tax Assets and Liabilities (Detail) - USD ($)	Sep. 30, 2016	Sep. 30, 2015
Deferred tax assets:
Net operating loss carryforwards	$ 7,095,000	$ 9,825,000
Foreign net operating losses	327,000	258,000
Stock based compensation	2,898,000	2,333,000
AMT credit carryforwards	279,000	149,000
Other, net	320,000	305,000
Research credit carryforwards	44,000	44,000
Total deferred assets	10,963,000	12,914,000
Deferred tax liabilities:
Intangibles	(473,000)	(603,000)
Foreign deferred liabilities	(356,000)	(415,000)
Net deferred tax asset	10,134,000	11,896,000
Valuation allowance for net deferred tax assets	(10,163,000)	(12,053,000)
Net deferred tax liability	$ (29,000)	$ (157,000)

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Income Taxes [Line Items]
Net change in total valuation allowance	$ (1,900,000)	$ (900,000)
Operating loss carryforwards, expiration start year	2018
Net operating loss carryforwards will begin to expire	2017
Investment credit carryforwards	$ 44,000	44,000
Alternative minimum tax credit carryforwards	279,000	$ 149,000
Accrued interest or penalties	0
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	37,400,000
Investment credit carryforwards	$ 29,000
Research and development credits expiry period beginning year	2023
State [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 31,700,000
Research and development credit [Member] \| Stock Option [Member] \| Federal and state [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	18,800,000
Research and development credit [Member] \| California [Member]
Income Taxes [Line Items]
Research and development credit carryforwards	$ 14,000

Income Taxes - Income Taxes Computed Using Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Amount computed using statutory rate							$ (666)	$ (674)	$ 1,798
Net change in valuation allowance for net deferred tax assets							1,889	1,619	(1,677)
AMT and other							(148)	151
Foreign rate differential							(70)	(1)
Non-deductible items							(1,136)	(182)	(411)
State income tax							(15)	(370)	288
Foreign net operating loss							147
Income tax (provision) benefit	$ 96	$ (79)	$ (16)	$ (32)	$ 578	$ (3)	$ 1	$ 543	$ (2)

Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2016 EUR (€) ft²
Loss Contingencies [Line Items]
Commencement date of term of lease	Oct. 01, 2016
Expiration date of term of lease	Apr. 30, 2020
Annual base rent	$ 600,000
Tenant improvement allowances	$ 300,000
Previous facility lease termination date	Oct. 16, 2016
Unamortized lease incentives	$ 49,000
Rent expense for the Company's operating leases	$ 300,000	$ 400,000	$ 400,000
IDchecker [Member]
Loss Contingencies [Line Items]
Expiration date of term of lease	May 31, 2020
Annual base rent \| €				€ 48,000
Building [Member]
Loss Contingencies [Line Items]
Amended office space subject to the lease \| ft²	28,354			28,354
Sales office [Member]
Loss Contingencies [Line Items]
Expiration date of term of lease	May 31, 2017
Annual base rent \| €				€ 65,000
Defined contribution 401 K Plan [Member]
Loss Contingencies [Line Items]
Employer contribution amount	$ 63,000	$ 42,000	$ 0

Commitments and Contingencies - Future Annual Minimum Rental Payments Payable (Detail) $ in Thousands	Sep. 30, 2016 USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
2017	$ 499
2018	755
2019	776
2020	469
Total	$ 2,499

Revenue and Vendor Concentrations - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	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, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Revenue, Major Customer [Line Items]
Revenue	$ 9,670	$ 9,105	$ 8,522	$ 7,404	$ 7,866	$ 6,440	$ 5,672	$ 5,389	$ 5,544	$ 4,660	$ 4,484	$ 4,463	$ 34,701	$ 25,367	$ 19,150
Accounts receivable, net	4,949				3,937								4,949	3,937
Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenue													$ 6,300	$ 6,300	$ 5,700
Customer Concentration Risk [Member] \| Sales Revenue Net [Member]
Revenue, Major Customer [Line Items]
Total revenue, percentage													10.00%	10.00%	10.00%
Geographic Concentration Risk [Member] \| Sales Revenue Net [Member]
Revenue, Major Customer [Line Items]
Total revenue, percentage													15.00%	5.00%	4.00%
Customer One [Member] \| Customer Concentration Risk [Member] \| Sales Revenue Net [Member]
Revenue, Major Customer [Line Items]
Total revenue, percentage													18.00%	25.00%	30.00%
Major Customers [Member] \| Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 1,000				$ 1,100				$ 1,400				$ 1,000	$ 1,100	$ 1,400
Channel Partners [Member] \| Supplier Concentration Risk [Member] \| Sales Revenue Net [Member]
Revenue, Major Customer [Line Items]
Total revenue, percentage													10.00%

Quarterly Information (Unaudited) - Schedule of Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	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, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 9,670	$ 9,105	$ 8,522	$ 7,404	$ 7,866	$ 6,440	$ 5,672	$ 5,389	$ 5,544	$ 4,660	$ 4,484	$ 4,463	$ 34,701	$ 25,367	$ 19,150
Cost of revenue	940	793	720	942	825	591	558	497	520	608	450	571
Operating expenses	7,889	7,618	7,171	6,804	6,079	5,539	4,628	4,758	5,089	5,702	6,246	5,373
Operating income (loss)	841	694	631	(342)	962	310	486	134	(65)	(1,650)	(2,212)	(1,481)	1,824	1,892	(5,408)
Other income (expense), net	23	45	30	36	25	30	21	15	67	17	19	13	134	91	118
Income tax benefit (provision)	96		(79)	(16)	(32)	578		(3)					1	543	(2)
Net income (loss)	$ 960	$ 739	$ 582	$ (322)	$ 955	$ 918	$ 507	$ 146	$ 2	$ (1,633)	$ (2,193)	$ (1,468)	$ 1,959	$ 2,526	$ (5,292)
Net income (loss) per share:
Basic income (loss) per share	$ 0.03	$ 0.02	$ 0.02	$ (0.01)	$ 0.03	$ 0.03	$ 0.02	$ 0.00	$ 0.00	$ (0.05)	$ (0.07)	$ (0.05)	$ 0.06	$ 0.08	$ (0.17)
Shares used in calculating net income (loss) per share - basic	32,086,223	31,823,386	31,325,577	31,094,417	30,969,157	30,764,694	30,697,391	30,618,097	30,510,587	30,481,168	30,453,455	30,402,397	31,586,535	30,790,258	30,466,063
Diluted income (loss) per share	$ 0.03	$ 0.02	$ 0.02	$ (0.01)	$ 0.03	$ 0.03	$ 0.02	$ 0.00	$ 0.00	$ (0.05)	$ (0.07)	$ (0.05)	$ 0.06	$ 0.08	$ (0.17)
Shares used in calculating net income (loss) per share - diluted	34,859,861	34,531,964	33,133,920	31,094,417	31,664,178	31,645,696	31,321,259	31,173,815	31,022,148	30,481,168	30,453,455	30,402,397	33,818,501	31,480,241	30,466,063

Investments - Additional Information (Detail) - USD ($)	12 Months Ended
Investments - Additional Information (Detail) - USD ($)	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Investments Debt And Equity Securities [Abstract]
Other-than-temporary impairment charges recognized	$ 0	$ 0	$ 0