Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	MITK
Entity Registrant Name	MITEK SYSTEMS INC
Entity Central Index Key	0000807863
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		39,847,328

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 18,745	$ 9,028
Short-term investments	5,861	8,448
Accounts receivable, net	11,862	16,821
Prepaid expenses	2,070	2,278
Other current assets	2,600	1,053
Total current assets	41,138	37,628
Property and equipment, net	4,604	4,665
Intangible assets, net	28,468	32,947
Goodwill	33,440	34,407
Deferred income tax assets, net	17,580	15,356
Other non-current assets	2,410	2,147
Total assets	127,640	127,150
Current liabilities:
Accounts payable	3,117	3,573
Accrued payroll and related taxes	5,465	7,915
Deferred revenue, current portion	7,973	4,792
Acquisition-related contingent consideration	1,162	1,849
Other current liabilities	1,639	2,278
Total current liabilities	19,356	20,407
Contract liabilities, non-current	516	485
Deferred income tax liabilities	7,916	8,162
Other non-current liabilities	1,783	2,702
Total liabilities	29,571	31,756
Stockholders’ equity:
Preferred stock, $0.001 par value, 1,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.001 par value, 60,000,000 shares authorized, 39,348,080 and 37,961,224 issued and outstanding, as of March 31, 2019 and September 30, 2018, respectively	39	38
Additional paid-in capital	124,613	116,944
Accumulated other comprehensive loss	(2,594)	(586)
Accumulated deficit	(23,989)	(21,002)
Total stockholders’ equity	98,069	95,394
Total liabilities and stockholders’ equity	$ 127,640	$ 127,150

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2019	Sep. 30, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	39,348,080	37,961,224
Common stock, shares outstanding (in shares)	39,348,080	37,961,224

CONSOLIDATED STATEMENTS OF OPERATIONS AND OTHER COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Total revenue	$ 19,983	$ 14,277	$ 37,666	$ 26,413
Operating costs and expenses
Selling and marketing	6,752	5,348	13,960	10,123
Research and development	5,290	3,501	9,778	6,781
General and administrative	4,827	3,773	10,669	7,290
Acquisition-related costs and expenses	1,773	1,203	3,600	2,462
Total operating costs and expenses	21,633	15,542	43,876	29,990
Operating loss	(1,650)	(1,265)	(6,210)	(3,577)
Other income, net	140	204	154	394
Loss before income taxes	(1,510)	(1,061)	(6,056)	(3,183)
Income tax benefit (provision)	794	(99)	2,149	(3,713)
Net loss	$ (716)	$ (1,160)	$ (3,907)	$ (6,896)
Net loss per share - basic and diluted (in dollars per share)	$ (0.02)	$ (0.03)	$ (0.10)	$ (0.20)
Shares used in calculating net loss per share - basic and diluted (in shares)	38,926	34,976	38,583	34,587
Components of other comprehensive loss:
Foreign currency translation adjustment	$ (1,203)	$ 403	$ (2,027)	$ 592
Unrealized gain (loss) on investments	6	(12)	19	(71)
Other comprehensive loss	(1,913)	(769)	(5,915)	(6,375)
Software and hardware
Total revenue	10,585	8,773	20,580	15,979
Operating costs and expenses
Cost of revenue	907	485	1,752	1,204
Service and other
Total revenue	9,398	5,504	17,086	10,434
Operating costs and expenses
Cost of revenue	$ 2,084	$ 1,232	$ 4,117	$ 2,130

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Sep. 30, 2017		33,724,000
Beginning Balance at Sep. 30, 2017	$ 61,408	$ 34	$ 78,677	$ (17,450)	$ 147
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)		73,000
Exercise of stock options	166		166
Settlement of restricted stock units (in shares)		596,000
Settlement of restricted stock units	0
Acquisition-related shares issued (in shares)		666,000
Acquisition-related shares issued	5,610	$ 1	5,609
Stock-based compensation expense	3,947		3,947
Amortization of earnout shares	710		710
Components of other comprehensive loss:
Net loss	(6,896)			(6,896)
Foreign currency translation adjustment	592				592
Unrealized gain (loss) on investments	(71)				(71)
Other comprehensive loss	(6,375)
Ending Balance (in shares) at Mar. 31, 2018		35,059,000
Ending Balance at Mar. 31, 2018	73,721	$ 35	89,109	(16,091)	668
Beginning Balance (in shares) at Dec. 31, 2017		34,903,000
Beginning Balance at Dec. 31, 2017	72,401	$ 35	87,020	(14,931)	277
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)		9,000
Exercise of stock options	31		31
Settlement of restricted stock units (in shares)		147,000
Settlement of restricted stock units	0
Stock-based compensation expense	2,058		2,058
Components of other comprehensive loss:
Net loss	(1,160)			(1,160)
Foreign currency translation adjustment	403				403
Unrealized gain (loss) on investments	(12)				(12)
Other comprehensive loss	(769)
Ending Balance (in shares) at Mar. 31, 2018		35,059,000
Ending Balance at Mar. 31, 2018	$ 73,721	$ 35	89,109	(16,091)	668
Beginning Balance (in shares) at Sep. 30, 2018	37,961,224	37,961,000
Beginning Balance at Sep. 30, 2018	$ 95,394	$ 38	116,944	(21,002)	(586)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	637,051	637,000
Exercise of stock options	$ 2,156		2,156
Settlement of restricted stock units (in shares)		682,000
Settlement of restricted stock units	0	$ 1	(1)
Issuance of common stock under employee stock purchase plan (in shares)		68,000
Issuance of common stock under employee stock purchase plan	491		491
Stock-based compensation expense	5,023		5,023
Components of other comprehensive loss:
Net loss	(3,907)			(3,907)
Foreign currency translation adjustment	(2,027)				(2,027)
Unrealized gain (loss) on investments	19				19
Other comprehensive loss	$ (5,915)
Ending Balance (in shares) at Mar. 31, 2019	39,348,080	39,348,000
Ending Balance at Mar. 31, 2019	$ 98,069	$ 39	124,613	(23,989)	(2,594)
Beginning Balance (in shares) at Dec. 31, 2018		38,639,000
Beginning Balance at Dec. 31, 2018	95,568	$ 39	120,199	(23,273)	(1,397)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)		502,000
Exercise of stock options	1,570		1,570
Settlement of restricted stock units (in shares)		139,000
Issuance of common stock under employee stock purchase plan (in shares)		68,000
Issuance of common stock under employee stock purchase plan	491		491
Stock-based compensation expense	2,353		2,353
Components of other comprehensive loss:
Net loss	(716)			(716)
Foreign currency translation adjustment	(1,203)				(1,203)
Unrealized gain (loss) on investments	6				6
Other comprehensive loss	$ (1,913)
Ending Balance (in shares) at Mar. 31, 2019	39,348,080	39,348,000
Ending Balance at Mar. 31, 2019	$ 98,069	$ 39	$ 124,613	$ (23,989)	$ (2,594)

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net loss	$ (3,907)	$ (6,896)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock-based compensation expense	5,023	3,947
Amortization of closing and earnout shares	0	355
Amortization of intangible assets	3,537	1,119
Depreciation and amortization	678	200
Amortization of investment premiums and other	(28)	(26)
Deferred taxes	(2,496)	4,417
Changes in assets and liabilities:
Accounts receivable	4,825	949
Other assets	(493)	(1,951)
Accounts payable	(435)	(367)
Accrued payroll and related taxes	(2,505)	66
Deferred revenue	3,250	1,156
Other liabilities	(829)	838
Net cash provided by operating activities	6,620	3,807
Investing activities:
Purchases of investments	(5,241)	(15,412)
Sales and maturities of investments	7,880	29,365
Acquisitions, net of cash acquired	0	(2,991)
Purchases of property and equipment	(694)	(1,742)
Net cash provided by investing activities	1,945	9,220
Financing activities:
Proceeds from the issuance of equity plan common stock	2,647	166
Payment for acquisition-related contingent consideration	(1,029)	0
Principal payments on other borrowings	(250)	(249)
Net cash provided by (used in) financing activities	1,368	(83)
Foreign currency effect on cash and cash equivalents	(216)	5
Net increase in cash and cash equivalents	9,717	12,949
Cash and cash equivalents at beginning of period	9,028	12,289
Cash and cash equivalents at end of period	18,745	25,238
Supplemental disclosures of cash flow information:
Cash paid for income taxes	296	85
Supplemental disclosures of non-cash investing and financing activities:
Unrealized holding gain (loss) on available-for-sale investments	$ 19	$ (71)

Nature of Operations and Summary of Significant Accounting Policies

6 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations

Mitek Systems, Inc. ("Mitek" or the "Company") is a leading innovator of mobile capture and digital identity verification solutions. Mitek is a software development company with expertise in artificial intelligence and machine learning. The Company is currently serving more than 6,500 financial services organizations and leading marketplace and financial technology ("fintech") brands across the globe. The Company's solutions are embedded in native mobile apps and mobile optimized websites to facilitate better mobile user experiences, fraud detection and reduction, and compliant transactions.

Mitek's Mobile Deposit® solution is used today by millions of consumers in the United States ("U.S."), Canada, the United Kingdom, and Australia for mobile check deposit. Mobile Deposit® is the category leading product that allows individuals and businesses to remotely deposit checks using their camera-equipped smartphone or tablet. The Company's Mobile Deposit® solution has now processed over three billion check deposits. Mitek began selling Mobile Deposit® in the second fiscal quarter of 2008, and received its first patent issued for this product in August 2010.

Mitek’s Mobile Verify™ is an important technology used to verify people’s identities at the point of onboarding via web or mobile device. Scanning an identity document enables an enterprise to identify the person with whom they are conducting business, comply with growing governmental Know Your Customer and Anti-Money Laundering ("AML") regulatory requirements, and to improve the overall customer experience for digital onboarding. To be sure the person submitting the identity document is who they say they are, Mitek's Mobile Verify Face Comparison provides an incremental layer of verification and compares the face on the identity document with the selfie photo of the user. Mitek's Mobile Verify Face Comparison technology uses advanced liveness detection so it cannot be spoofed.

The identification capture process provided by Mitek can also provide prefill of much of the data obtained from the identity document into an application, requiring far fewer key strokes, reducing keying errors, and improving both operational efficiency and the customer experience. Today, the financial services verticals (banks, credit unions, lenders, payments processors, card issuers, fintech companies, etc.) represent the greatest percentage of use of the Company's solutions, but marketplaces, sharing economy, telecommunications, healthcare, travel, and retail sectors are showing accelerated adoption. Similarly, websites that must verify the customer’s age (or other consumer information) prior to selling goods can do so by verifying identity documents. Mitek uses machine learning to constantly improve the product performance of Mobile Verify™ and applies artificial intelligence to increase automation and speed of approvals of identification documents.

The core of the Company's user experience is Mitek MiSnap™, a touch-free automated capture technology which can be incorporated across product lines. It provides a simple and superior user-experience, making transactions on mobile devices fast, accurate, and easy for the consumer while helping organizations drive revenue from the increasingly popular mobile channel.

Mobile Fill™, Mitek's mobile identity capture solution, enables the camera to serve as a keyboard. Using Mobile Fill™, consumers can quickly prefill any form with personal data by simply snapping a picture of their driver's license, credit card, or other similar identity document.

CheckReader™, which the Company acquired through the acquisition of A2iA (as defined below), enables financial institutions to automatically extract data from a check image received across all deposit channels – branch, ATM, Remote Deposit Capture, and mobile. Through the automatic recognition of all fields on checks, whether handwritten or machine print, CheckReader™ speeds the time to deposit for banks and customers and reduces costs formerly incurred before images could be exchanged.

ID_CLOUD™ is a fully automated identity verification solution that can be integrated into a customer’s application to instantly read and validate identity documents. ID_CLOUD™ automated technology enables global enterprises to improve their customer acquisition technology while meeting AML requirements in a safe and cost-effective manner. This solution is available in the cloud, and via mobile websites and desktop applications. Additionally, a version of ID_CLOUD™ is available that works locally on a desktop that is connected to a proprietary hardware scanner for reading and validating identity documents.

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

As of March 31, 2019, the Company has been granted 50 patents and it has an additional 20 patent applications pending.

Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Company as of March 31, 2019 have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X and, accordingly, they do not include all information and footnote disclosures required by accounting principles generally accepted in the U.S. (“GAAP”). The Company believes the footnotes and other disclosures made in the financial statements are adequate for a fair presentation of the results of the interim periods presented. The financial statements include all adjustments (solely of a normal recurring nature) which are, in the opinion of management, necessary to make the information presented not misleading. Certain reclassifications were made to previously reported amounts in the consolidated statements of cash flows to make them consistent with the current period presentation. You should read these financial statements and the accompanying notes in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2018, filed with the U.S. Securities and Exchange Commission on December 14, 2018.

Results for the three months ended March 31, 2019 are not necessarily indicative of results for any other interim period or for a full fiscal year.

Principles of Consolidation

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

Foreign Currency

The Company has foreign subsidiaries that operate and sell products and services in various countries and jurisdictions around the world. As a result, the Company is exposed to foreign currency exchange risks. For those subsidiaries whose functional currency is not the U.S. dollar, assets and liabilities are translated into U.S. dollars 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 loss in the consolidated balance sheets. The Company recorded a net loss resulting from foreign exchange translation of $1.2 million for the three months ended March 31, 2019 and a net gain resulting from foreign exchange translation of $0.4 million for the three months ended March 31, 2018. The Company recorded a net loss resulting from foreign exchange translation of $2.0 million for the six months ended March 31, 2019 and a net gain resulting from foreign exchange translation of $0.6 million for the six months ended March 31, 2018.

Use of Estimates

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

Revenue Recognition

The Company recognizes revenue in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers, and its related amendments (collectively known as “ASC 606”). ASC 606 outlines a single comprehensive model to use in accounting for revenue arising from contracts with customers. The core principle, involving a five-step process, of the revenue model is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.

The Company generates revenue primarily from the delivery of licenses (to both on premise and transactional software as a service ("SaaS") products) and related services, as well as the delivery of hardware and professional services. Revenue is measured based on consideration specified in a contract with a customer. The Company recognizes revenue when it satisfies a performance obligation by transferring control over a product or service to a customer which may be at a point in time or over time. See Note 2 of the consolidated financial statements for additional details.

Net Loss Per Share

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

For the three and six months ended March 31, 2019 and 2018, the following potentially dilutive common shares were excluded from the calculation of net loss per share, as they would have been antidilutive (amounts in thousands):


	Three Months Ended March 31,			Six Months Ended March 31,
	2019	2018	2019	2018
Stock options	2,390	3,047	2,390	3,047
RSUs	2,682	2,670	2,682	2,670
ESPP common stock equivalents	65	—	65	—


Total potentially dilutive common shares outstanding	5,137	5,717	5,137	5,717

The calculation of basic and diluted net loss per share is as follows (amounts in thousands, except per share data):


	Three Months Ended March 31,						Six Months Ended March 31,
	2019		2018		2019		2018
Net loss	$	(716)	$	(1,160)	$	(3,907)	$	(6,896)
Weighted-average shares outstanding—basic	38,926		34,976		38,583		34,587
Common stock equivalents	—		—		—		—
Weighted-average shares outstanding—diluted	38,926		34,976		38,583		34,587
Net loss per share:
Basic	$	(0.02)	$	(0.03)	$	(0.10)	$	(0.20)
Diluted	$	(0.02)	$	(0.03)	$	(0.10)	$	(0.20)

Investments

Investments consist of corporate notes and bonds, commercial paper, and U.S. Treasury securities. The Company classifies investments as available-for-sale at the time of purchase and reevaluates such classification as of each balance sheet date. All investments are recorded at estimated fair value. Unrealized gains and losses for available-for-sale securities are included in accumulated other comprehensive loss, 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, net in the consolidated statements of operations and other comprehensive loss. No other-than-temporary impairment charges were recognized in the three and six months ended March 31, 2019 and 2018.

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

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 $0.1 million of write-offs to the allowance for doubtful accounts in the three and six months ended March 31, 2019. The Company had no write-offs to the allowance for doubtful accounts for the three and six months ended March 31, 2018. The Company maintained an allowance for doubtful accounts of $0.2 million and $0.3 million as of March 31, 2019 and September 30, 2018, respectively.

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. The Company capitalized $0.1 million of software development costs during the six months ended March 31, 2019. For the six months ended March 31, 2018, no software development costs were capitalized because the time period and costs incurred between technological feasibility and general release for all software product releases were not material or were not realizable. We had no amortization expense from capitalized software costs during the six months ended March 31, 2019 and 2018.

Costs related to software acquired, developed, or modified solely to meet our internal requirements, with no substantive plans to market such software at the time of development, are capitalized. Costs incurred during the preliminary planning and evaluation stage of the project and during post implementation operational stage are expensed as incurred. Costs incurred during the application development stage of the project are capitalized. The Company defines the design, configuration, and coding process as the application development stage. The Company capitalized $0.1 million and $0.3 million of costs related to computer software developed for internal use during the six months ended March 31, 2019 and 2018, respectively. The Company had $0.2 million in amortization expense from internal use software during the six months ended March 31, 2019 and no amortization expense from internal use software during the six months ended March 31, 2018.

Goodwill and Purchased Intangible Assets

The Company’s goodwill and intangible assets resulted from prior acquisitions. 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 350”), the Company reviews its goodwill and indefinite-lived intangible assets 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. No such events or circumstances have occurred since the last impairment assessment was performed.

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 350 and ASC Topic 280, Segment Reporting, 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 believes this represents the best evidence of fair value. In the fourth quarter of fiscal 2018, management completed its annual goodwill impairment test and concluded that the Company’s goodwill was not impaired. The Company’s conclusion that goodwill was not impaired was based on a comparison of its net assets to its market capitalization.

Because the Company determines the fair value of its reporting unit based on its market capitalization, the Company’s future reviews of goodwill for impairment may be impacted by changes in the price of the Company’s common stock, par value $0.001 per share (“Common Stock”). For example, a significant decline in the price of the Common Stock may cause the fair value of its goodwill to fall below its carrying value. Therefore, the Company cannot assure that when it completes its future reviews of goodwill for impairment a material impairment charge will not be recorded.

Intangible assets are amortized over their useful lives. Each period, the Company evaluates the estimated remaining useful life of its intangible assets and whether events or changes in circumstances warrant a revision to the remaining period of amortization. The carrying amounts of these assets are periodically reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. Recoverability of these assets is measured by comparing the carrying amount of each asset to the future undiscounted cash flows the asset is expected to generate. The carrying amount of such assets is reduced to fair value if the undiscounted cash flows used in the test for recoverability are less than the carrying amount of such assets.

Income Taxes

The Company accounts for income taxes in accordance with FASB ASC Topic 740, Income Taxes. 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 7 of the consolidated financial statements 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 7 of the consolidated financial statements for additional details.

Stock-Based Compensation

The Company issues RSUs, stock options, performance options, and Senior Executive Long Term Incentive Restricted Stock Units (“Senior Executive Performance RSUs”) as awards to its employees. Additionally, eligible employees may participate in the Company’s ESPP. Employee stock awards are measured at fair value on the date of grant and expense is recognized using the straight-line single-option method in accordance with FASB ASC Topic 718, Compensation-Stock Compensation. Forfeitures are recorded as they occur.

The Company assigns fair value to RSUs based on the closing stock price on the date of grant.

The Company estimates the fair value of stock options and ESPP shares 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 Company estimates the fair value of Senior Executive Performance RSUs, performance options, and similar awards using the Monte-Carlo simulation. The Monte-Carlo simulation requires subjective assumptions, including the Company’s valuation date stock price, the annual risk-free interest rate, expected volatility, the probability of reaching the performance targets, and a 20-trading-day average stock price.

Other Borrowings

The Company has certain loan agreements with Spanish government agencies which were assumed when the Company acquired ICAR Vision Systems, S.L. ("ICAR"). These agreements have repayment periods of five to twelve years and bear no interest. As of March 31, 2019, $0.5 million was outstanding under these agreements and $0.1 million and $0.4 million is recorded in other current liabilities and other non-current liabilities, respectively, in the consolidated balance sheets. As of September 30, 2018, $0.8 million was outstanding under these agreements and $0.3 million and $0.5 million was recorded in other current liabilities and other non-current liabilities, respectively, in the consolidated balance sheets.

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.

Comprehensive Loss

Comprehensive loss consists of net loss, unrealized gains and losses on available-for-sale securities, and foreign currency translation adjustments. Included on the consolidated balance sheets is accumulated other comprehensive loss of $2.6 million and $0.6 million at March 31, 2019 and September 30, 2018, respectively.

Recently Adopted Accounting Pronouncements

In October 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”), which eliminates the current prohibition on immediate recognition of the current and deferred income tax effects of intra-entity transfers of assets other than inventory, with the intent of reducing complexity and diversity in practice. Under ASU 2016-16, entities must recognize the income tax consequences when the transfer occurs rather than deferring recognition. For public entities, ASU 2016-16 is effective for fiscal years, including interim periods within those fiscal years, beginning after December 15, 2017. Entities must apply the guidance on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The Company adopted ASU 2016-16 in the first quarter of 2019, and the adoption did not have a material impact on its consolidated financial statements.

In May 2014, the FASB issued guidance codified in ASC 606, to replace existing revenue recognition rules with a single comprehensive model to use in accounting for revenue arising from contracts with customers. Under ASC 606, revenue is recognized when a customer obtains control of promised goods or services for an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. In addition, ASC 606 requires expanded disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers.

The Company adopted ASC 606 on October 1, 2018 for all contracts that were not completed as of the adoption date using the modified retrospective method and the practical expedient was not applied. The Company recognized the cumulative effect of initially applying the new revenue standard as an adjustment to the opening balance of accumulated deficit. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The Company expects the impact of the adoption of the new revenue standard to be immaterial to our net income on an ongoing basis.

See Note 2 of the consolidated financial statements for additional details on the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers.

Change in Significant Accounting Policy

Except for the changes below, the Company has consistently applied the accounting policies to all periods presented in its consolidated financial statements. The details of the significant changes and quantitative impact of the changes are disclosed below.

Contract Assets and Liabilities

The Company previously recognized license revenue on term licenses and transactional SaaS revenue on the date payments become due and payable. Under ASC 606, the Company recognizes revenue when control of the license or transactional SaaS service is transferred to the customer. The Company records a contract asset when the revenue is recognized prior to the date payments become due.

Contract assets that are expected to be paid within one year are recorded in other current assets on the consolidated balance sheets. All other contracts assets are recorded in other non-current assets in the consolidated balance sheet. Contract liabilities consist of deferred revenue. When the performance obligation is expected to be fulfilled within one year, the deferred revenue is recorded in current liabilities in the consolidated balance sheet. When the performance obligation is expected to be fulfilled beyond one year, the deferred revenue is recorded in non-current liabilities in the consolidated balance sheet. The Company reports net contract asset or liability positions on a contract-by-contract basis at the end of each reporting period.

Contract Acquisition Costs

The Company previously recognized commission costs in the period earned if the contract was for one year or less. Under ASC 606, when the commission rate for a customer renewal is not commensurate with the commission rate for a new contract, the commission is capitalized if expected to be recovered. Such costs are capitalized on a contract-by-contract basis and amortized using a portfolio approach consistent with the pattern of transfer of the good or service to which the asset relates. Contract acquisition costs are recorded in other current and non-current assets in the consolidated balance sheets.

Impacts on Financial Statements

The following table summarizes the cumulative effect of the changes made to the consolidated balance sheet as of October 1, 2018 due to the adoption of ASC 606 (amounts in thousands):


	Balance at September 30, 2018		Adjustments Due to the Adoption of ASC 606		Balance at October 1, 2018
Assets
Other current assets	$	1,053	$	169	$	1,222
Deferred income tax asset	15,356		(267)		15,089
Other non-current assets	2,147		507		2,654

Liabilities
Deferred revenue, current portion	4,792		(511)		4,281
Deferred revenue, non-current portion	485		—		485

Equity
Accumulated deficit	$	(21,002)	$	920	$	(20,082)

The following tables summarizes the impacts of ASC 606 adoption on the Company's consolidated financial statements as of and for the three and six months ended March 31, 2019 (amounts in thousands except per share data):


Consolidated Statement of Operations
	Impact of changes in accounting policies
Three Months Ended March 31, 2019:	As reported		Adjustments		Balances without adoption of ASC 606
Revenue
Software and hardware	$	10,585	$	(581)	$	10,004
Service and other	9,398		—		9,398
Total revenue	19,983		(581)		19,402

Operating expenses
Selling and marketing	$	6,752	$	(1)	$	6,751

	Impact of changes in accounting policies
Six Months Ended March 31, 2019:	As reported		Adjustments		Balances without adoption of ASC 606
Revenue
Software and hardware	$	20,580	$	(1,271)	$	19,309
Service and other	17,086		—		17,086
Total revenue	37,666		(1,271)		36,395

Operating expenses
Selling and marketing	$	13,960	$	10	$	13,970


Consolidated Balance Sheet
	Impact of changes in accounting policies
March 31, 2019:	As reported		Adjustments		Balances without adoption of ASC 606
Assets
Other current assets	$	2,600	$	(1,012)	$	1,588
Deferred income tax asset	17,580		555		18,135
Other non-current assets	2,410		(10)		2,400

Liabilities
Deferred revenue, current portion	7,973		1,210		9,183
Deferred revenue, non-current portion	516		—		516

Equity
Accumulated deficit	$	(23,989)	$	(1,677)	$	(25,666)

Recently Issued Accounting Pronouncements

In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (ASC 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract ("ASU 2018-15"), which requires hosting arrangements that are service contracts to follow the guidance for internal-use software to determine which implementation costs can be capitalized. ASU 2018-15 is effective either prospectively or retrospectively for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. The Company does not expect the adoption of ASU 2018-15 to have a material impact on its consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement, to eliminate, add, and modify certain disclosure requirements for fair value measurements. Entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but public companies will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The guidance is effective for annual and interim periods beginning after December 15, 2019, but entities are permitted to early adopt either the entire standard or only the provisions that eliminate or modify the requirements. The Company is currently evaluating how to apply the new guidance.

In February 2018, the FASB issued ASU No. 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”). Under previously existing GAAP, the effects of changes in tax rates and laws on deferred tax balances are recorded as a component of income tax expense in the period in which the law was enacted. When deferred tax balances related to items originally recorded in accumulated other comprehensive income are adjusted, certain tax effects become stranded in accumulated other comprehensive income. The amendments in ASU 2018-02 allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The amendments in this ASU also require certain disclosures about stranded tax effects. The guidance is required for fiscal years beginning after December 15, 2018 (our fiscal year 2020), and interim periods within those fiscal years. Early adoption in any period is permitted. The Company does not expect the adoption of ASU 2018-02 to have a material impact on its consolidated financial statements.

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

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

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

No other new accounting pronouncement issued or effective during the three months ended March 31, 2019 had, or is expected to have, a material impact on the Company’s consolidated financial statements.

Revenue Recognition

6 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

Nature of Goods and Services

The following is a description of principal activities from which the Company generates its revenue. Contracts with customers are evaluated on a contract-by-contract basis as contracts may include multiple types of goods and services as described below.

Software and Hardware

Software and hardware revenue is generated from on premise software license sales, as well as sales of hardware scanner boxes and on premise appliance products. For software license agreements that are distinct, the Company recognizes software license revenue upon delivery and after evidence of a contract exists. Hardware revenue is recognized in the period that the hardware is shipped.

Service and Other

Service and other revenue is generated from the sale of transactional SaaS products and services, maintenance associated with the sale of software and hardware, and consulting and professional services. The Company recognizes services and other revenue over the period in which such services are performed. The Company’s model typically includes an up-front fee and a periodic 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 periodic commitment includes, but is not limited to, a fixed periodic fee and / or a transactional fee based on system usage that exceeds committed minimums. If the up-front fee is not distinct, revenue is deferred until the date the customer commences use of the Company’s services, at which point the up-front fee is recognized ratably over the life of the customer arrangement. The Company does not view the signing of the contract or the provision of initial setup services as discrete earnings events that are distinct.

Significant Judgments in Application of the Guidance

The Company uses the following methods, inputs, and assumptions in determining amounts of revenue to recognize:

Identification of Performance Obligations

For contracts that contain multiple performance obligations, which include combinations of software licenses, maintenance, and services, the Company accounts for individual goods or services as a separate performance obligation if they are distinct. The good or service is distinct if the good or service is separately identifiable from other items in the arrangement and if a customer can benefit from it on its own or with other resources that are readily available to the customer. If these criteria are not met, the promised goods or services are accounted for as a combined performance obligation.

Determination of Transaction Price

The transaction price is determined based on the consideration to which the Company will be entitled in exchange for transferring products or services to the customer. The Company includes any fixed charges within its contracts as part of the total transaction price. To the extent that variable consideration is not constrained, the Company includes an estimate of the

variable amount, as appropriate, within the total transaction price and updates its assumptions over the duration of the contract. As a practical expedient, the Company does not adjust the transaction price for the effects of a significant financing component if, at contract inception, the period between customer payment and the transfer of goods or services is expected to be one year or less.

Assessment of Estimates of Variable Consideration

Many of the Company’s contracts with customers contain some component of variable consideration; however, the constraint will generally not result in a reduction in the estimated transaction price for most forms of variable consideration. The Company may constrain the estimated transaction price in the event of a high degree of uncertainty as to the final consideration amount owed because of an extended length of time over which the fees may be adjusted.

Allocation of Transaction Price

The transaction price, including any discounts, is allocated between separate goods and services in a contract that contains multiple performance obligations based on their relative standalone selling prices. The standalone selling prices are determined based on the prices at which the Company separately sells each good or service. For items that are not sold separately, the Company estimates the standalone selling prices using available information such as market conditions and internally approved pricing guidelines. In instances where there are observable selling prices for professional services and support and maintenance, the Company may apply the residual approach to estimate the standalone selling price of software licenses. In certain situations, primarily transactional SaaS revenue described above, the Company allocates variable consideration to a series of distinct goods or services within a contract. The Company allocates variable payments to one or more, but not all, of the distinct goods or services or to a series of distinct goods or services in a contract when (i) the variable payment relates specifically to the Company’s efforts to transfer the distinct good or service and (ii) the variable payment is for an amount that depicts the amount of consideration to which the Company expects to be entitled in exchange for transferring the promised goods or services to its customer.

Disaggregation of Revenue

The following table presents the Company's revenue disaggregated by major product category (amounts in thousands):


	Three Months Ended March 31,						Six Months Ended March 31,
	2019		2018		2019		2018
Major product category
Deposits software and hardware	$	9,215	$	6,735	$	18,265	$	11,882
Deposits services and other	3,693		1,876		6,513		3,830
Deposits revenue	12,908		8,611		24,778		15,712
Identity verification software and hardware	1,370		2,038		2,315		4,097
Identity verification services and other	5,705		3,628		10,573		6,604
Identity verification revenue	7,075		5,666		12,888		10,701
Total revenue	19,983		14,277		37,666		26,413

Software and hardware revenue is generated from on premise software license sales, as well as sales of hardware scanner boxes and on premise appliance products. Service and other revenue is generated from the sale of transactional SaaS products and services, maintenance associated with the sale of software and hardware, and consulting and professional services.

Contract Balances

The following table provides information about contract assets and contract liabilities from contracts with customers (amounts in thousands):


	March 31, 2019		October 1, 2018
Contract assets, current	$	1,021	$	169
Contract assets, non-current	—		507
Contract liabilities, current	7,973		4,792
Contract liabilities, non-current	$	516	$	485

Contract assets, reported within other current and long-term assets in the consolidated balance sheet, primarily result from revenue being recognized when a license is delivered and payments are made over time. Contract liabilities primarily relate to advance consideration received from customers, deferred revenue, for which transfer of control occurs, and therefore revenue is recognized, as services are provided. Contract balances are reported in a net contract asset or liability position on a contract-by-contract basis at the end of each reporting period. The Company recognized $3.6 million of revenue during the six months ended March 31, 2019 that was included in the contract liability balance at the beginning of the period.

Contract Costs

The Company incurs incremental costs to obtain a contract, consisting primarily of sales commissions incurred only if a contract is obtained. Capitalized sales commissions included in other current and non-current assets on the consolidated balance sheets totaled $1.4 million and $1.0 million at March 31, 2019 and October 1, 2018, respectively.

Capitalized contract costs are amortized based on the transfer of goods or services to which the asset relates. The amortization period also considers expected customer lives and whether the asset relates to goods or services transferred under a specific anticipated contract. These costs are included in selling and marketing expenses in the consolidated statement of operations and totaled $0.1 million and $0.2 million during the three and six months ended March 31, 2019. There was no impairment loss recognized during the six months ended March 31, 2019 related to capitalized contract costs.

Business Combinations

6 Months Ended

Mar. 31, 2019

Business Combinations [Abstract]

BUSINESS COMBINATIONS

A2iA Group II, S.A.S.

On May 23, 2018, the Company acquired all of the issued and outstanding shares of A2iA Group II, S.A.S. ("A2iA"), a simplified joint stock company formed under the laws of France, pursuant to a share purchase agreement, by and among the Company, each of the holders of outstanding shares of A2iA and Andera Partners, S.C.A., as representative of the sellers (the “A2iA Acquisition”). Upon completion of the A2iA Acquisition, A2iA became a direct wholly owned subsidiary of the Company. The A2iA Acquisition extends Mitek’s global leadership position in both mobile check deposit and digital identity verification and combines the two market leaders in document recognition and processing.

As consideration for the A2iA Acquisition, the Company (i) made a cash payment of $26.8 million, net of cash acquired; (ii) issued 2,514,588 shares, or $21.9 million, of the Company’s Common Stock; and (iii) incurred transaction related liabilities of $0.2 million.

The Company incurred $2.2 million of expense in connection with the A2iA Acquisition primarily related to legal fees, outside service costs, and travel expense, which are included in acquisition-related costs and expenses in the consolidated statements of operations and other comprehensive loss.

On May 23, 2018, the Company deposited $0.7 million of the cash payment and 508,479 shares, or $4.4 million, of Common Stock into an escrow fund to serve as collateral and partial security for certain indemnification rights of the Company. The escrow fund will be maintained for up to 24 months following the completion of the A2iA Acquisition or until such earlier time as the escrow fund is exhausted.

The Company used cash on hand for the cash paid on May 23, 2018.

ICAR Vision Systems, S.L.

On October 16, 2017, Mitek Holding B.V., a company incorporated under the laws of The Netherlands and a wholly owned subsidiary of the Company (“Mitek Holding B.V.”), acquired all of the issued and outstanding shares of ICAR, a company incorporated under the laws of Spain (the “ICAR Acquisition”), and each of its subsidiaries, pursuant to a Share Purchase Agreement (the “Purchase Agreement”), by and among, the Company, Mitek Holding B.V., and each of the shareholders of ICAR (the “Sellers”). Upon completion of the ICAR Acquisition, ICAR became a direct wholly owned subsidiary of Mitek Holding B.V. and an indirect wholly owned subsidiary of the Company. ICAR is a leading provider of consumer identity verification solutions in Spain and Latin America. The ICAR Acquisition strengthens the Company’s position as a global digital identity verification powerhouse in the Consumer Identity and Access Management solutions market.

As consideration for the ICAR Acquisition, the Company: (i) made a cash payment to Sellers of $3.0 million, net of cash acquired and subject to adjustments for transaction expenses, escrow amounts, indebtedness, and working capital adjustments; and (ii) issued to Sellers of 584,291 shares, or $5.6 million, of Common Stock. In addition to the foregoing, the Sellers could be entitled to additional cash consideration upon achievement of certain milestones as follows: (a) subject to achievement of the revenue target for the fourth quarter of calendar 2017, the Company will pay to Sellers up to $1.5 million (the “Q4 Consideration”), which amount shall be deposited (as additional funds) into the escrow fund described below; and (b) subject to achievement of certain revenue and net income targets for ICAR for the twelve-month period ending on September 30, 2018,

and the twelve-month period ending on September 30, 2019, the Company will pay to Sellers up to $3.8 million in additional cash consideration (the “Earnout Consideration”); provided that if the revenue target set forth in clause (a) is not met, then the Q4 Consideration will instead be added to the Earnout Consideration payable upon (and subject to) achievement of the revenue and net income targets for the twelve-month period ending on September 30, 2018. The Company estimated the fair value of the total Q4 Consideration and Earnout Consideration to be $2.9 million on October 16, 2017, which was determined using a discounted cash flow methodology based on financial forecasts determined by management that included assumptions about revenue growth and discount rates. Each quarter the Company evaluates the estimated fair value of the Earnout Consideration and revises if necessary.

The Company incurred $0.5 million of expense in connection with the ICAR Acquisition primarily related to legal fees, outside service costs, and travel expense, which are included in acquisition-related costs and expenses in the consolidated statements of operations and other comprehensive loss.

On October 16, 2017, the Company deposited $1.5 million of cash into an escrow fund to serve as collateral and partial security for working capital adjustments and certain indemnification rights. In April 2018, the Q4 Consideration of $1.5 million was deposited into the escrow fund. As a result of the achievement of earnout targets during fiscal 2018, the Company paid $1.8 million in January 2019. The escrow fund will be maintained for up to 24 months following the completion of the ICAR Acquisition or until such earlier time as the escrow fund is exhausted.

The Company used cash on hand for the cash paid on October 16, 2017, and under the terms of the Purchase Agreement, the Company has agreed to guarantee the obligations of Mitek Holding B.V. thereunder.

Acquisitions are accounted for using the purchase method of accounting in accordance with ASC Topic 805, Business Combinations. Accordingly, the results of operations of A2iA and ICAR have been included in the accompanying consolidated financial statements since the date of each acquisition. The purchase price for both the A2iA Acquisition and the ICAR Acquisition have been allocated to the tangible and intangible assets acquired and liabilities assumed based upon the respective estimates of fair value as of the date of each acquisition, and are based on assumptions that the Company’s management believes are reasonable given the information currently available. The Company is in the process of completing its valuation of certain intangible assets and the valuation of the acquired deferred income taxes of A2iA. The final allocations of each such purchase price to intangible assets and deferred income taxes may differ materially from the information presented in these unaudited consolidated financial statements.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed during the year ended September 30, 2018 (amounts shown in thousands):


	A2iA		ICAR		Total
Current assets	$	3,929	$	2,036	$	5,965
Property, plant, and equipment	307		83		390
Intangible assets	28,610		6,407		35,017
Goodwill	24,991		6,936		31,927
Other non-current assets	1,177		87		1,264
Current liabilities	(2,688)		(1,652)		(4,340)
Deferred income tax liabilities	(7,503)		(1,602)		(9,105)
Other non-current liabilities	(7)		(828)		(835)
Net assets acquired	$	48,816	$	11,467	$	60,283

The goodwill recognized is due to expected synergies and other factors and is not expected to be deductible for income tax purposes. The Company estimated the fair value of identifiable acquisition-related intangible assets with definite lives primarily based on discounted cash flow projections that will arise from these assets. The Company exercised significant judgment with regard to assumptions used in the determination of fair value such as with respect to discount rates and the determination of the estimated useful lives of the intangible assets. The following table summarizes the estimated fair values

and estimated useful lives of intangible assets with definite lives acquired during the year ended September 30, 2018 (amounts shown in thousands, except for years):


	Amortization Period	Amount assigned
A2iA
Completed technologies	7.0 years	$	13,015
Customer relationships	5.0 years	15,360
Trade names	5.0 years	235
Total intangible assets acquired from A2iA		$	28,610

ICAR
Completed technologies	5.0 years	$	4,956
Customer relationships	2.0 years	1,298
Trade names	3.0 years	153
Total intangible assets acquired from ICAR		$	6,407

The following unaudited pro forma financial information is presented as if the acquisitions had taken place at the beginning of the periods presented and should not be taken as representative of the Company’s future consolidated results of operations. The following unaudited pro forma information includes adjustments for the amortization expense related to the identified intangible assets.

The following table summarizes the Company’s unaudited pro forma financial information presented as if the acquisitions occurred on October 1, 2017 (amounts shown in thousands):


	Three Months Ended March 31,						Six Months Ended March 31,
	2019		2018		2019		2018
Pro forma revenue	$	20,192	$	19,653	$	39,089	$	36,974
Pro forma net loss	$	(658)	$	(1,086)	$	(2,638)	$	(7,061)

Investments

6 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

INVESTMENTS

The following tables summarize investments by type of security as of March 31, 2019 and September 30, 2018, respectively (amounts shown in thousands):


March 31, 2019:	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Market Value
Available-for-sale securities:

Corporate debt securities, short-term	$	5,862	$	—	$	(1)	$	5,861
Total	$	5,862	$	—	$	(1)	$	5,861


September 30, 2018:	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Market Value
Available-for-sale securities:
U.S. Treasury, short-term	$	3,693	$	—	$	(10)	$	3,683
Corporate debt securities, short-term	4,779		—		(14)		4,765
Total	$	8,472	$	—	$	(24)	$	8,448

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 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 March 31, 2019 and September 30, 2018, the Company’s short-term investments have maturity dates of less than one year

from the balance sheet date and 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 taxes, 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 that 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 on debt securities 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 three and six months ended March 31, 2019 and 2018. There were no realized gains or losses from the sale of available-for-sale securities during the three and six months ended March 31, 2019. The Company recorded net realized losses from the sale of available-for-sale securities of $24,000 in both the three and six months ended March 31, 2018.

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 the following three levels of inputs that may be used to measure fair value, of which the first two are considered observable and the last, unobservable:

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

•Level 2—Inputs other than Level 1 inputs 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.

The following tables represent the fair value hierarchy of the Company’s investments and acquisition-related contingent consideration as of March 31, 2019 and September 30, 2018, respectively (amounts shown in thousands):


March 31, 2019:	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Short-term investments:

Corporate debt securities
Financial	$	349	$	—	$	349	$	—
Industrial	1,298		—		1,298		—
Commercial paper
Financial	2,922		—		2,922		—
Industrial	1,292		—		1,292		—
Total assets at fair value	$	5,861	$	—	$	5,861	$	—
Liabilities:
Acquisition-related contingent consideration	1,162		—		—		1,162
Total liabilities at fair value	$	1,162	$	—	$	—	$	1,162


September 30, 2018:	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Short-term investments:
U.S. Treasury	$	3,683	$	3,683	$	—	$	—
Corporate debt securities
Financial	2,847		—		2,847		—
Industrial	1,918		—		1,918		—
Total assets at fair value	$	8,448	$	3,683	$	4,765	$	—
Liabilities:
Acquisition-related contingent consideration	3,051		—		—		3,051
Total liabilities at fair value	3,051		—		—		3,051

As of March 31, 2019, acquisition-related contingent consideration of $1.2 million is recorded in other current liabilities in the consolidated balance sheets. The following table includes a summary of the contingent consideration measured at fair value using significant unobservable inputs (Level 3) during the six months ended March 31, 2019 (amounts shown in thousands):


Balance at September 30, 2018	$	3,051


Payment of contingent consideration	(1,818)

Foreign currency effect on contingent consideration	(71)
Balance at March 31, 2019	$	1,162

Goodwill and Intangible Assets

6 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

Goodwill

The Company had a goodwill balance of $33.4 million at March 31, 2019, representing 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 ASC 350. The following table summarizes changes in the balance of goodwill during the six months ended March 31, 2019 (amounts shown in thousands):


Balance at September 30, 2018	$	34,407
A2iA purchase accounting adjustment	121
Foreign currency effect on goodwill	(1,088)
Balance at March 31, 2019	$	33,440

Intangible assets

Intangible assets include the value assigned to purchased completed technology, customer relationships, and trade names. The estimated useful lives for all of these intangible assets range from two to seven years. Intangible assets as of March 31, 2019 and September 30, 2018, respectively, are summarized as follows (amounts shown in thousands, except for years):


March 31, 2019:	Weighted Average Amortization Period	Cost		Accumulated Amortization		Net
Completed technologies	6.4 years	$	20,341	$	5,202	$	15,139
Customer relationships	4.8 years	17,628		4,615		13,013
Trade names	4.5 years	618		302		316
Total intangible assets		$	38,587	$	10,119	$	28,468


September 30, 2018:	Weighted Average Amortization Period	Cost		Accumulated Amortization		Net
Completed technologies	6.4 years	$	20,341	$	3,070	$	17,271
Customer relationships	4.8 years	17,628		2,351		15,277
Trade names	4.5 years	618		219		399
Total intangible assets		$	38,587	$	5,640	$	32,947

Amortization expense related to acquired intangible assets was $1.8 million and $0.6 million for the three months ended March 31, 2019 and 2018, respectively, and $3.5 million and $1.1 million for the six months ended March 31, 2019 and 2018, respectively, and is recorded within acquisition-related costs and expenses on the consolidated statements of operations and other comprehensive loss.

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
2019 (remaining six months)	$	3,502
2020	6,400
2021	6,134
2022	5,739
2023	3,766
2024	1,779
Thereafter	1,148
Total	$	28,468

Stockholders' Equity

6 Months Ended

Mar. 31, 2019

Equity [Abstract]

STOCKHOLDERS' EQUITY

STOCKHOLDERS’ EQUITY

Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense related to RSUs, stock options, and ESPP shares, which was allocated as follows (amounts shown in thousands):


	Three Months Ended March 31,						Six Months Ended March 31,
	2019		2018		2019		2018
Cost of revenue	$	56	$	22	$	100	$	40
Selling and marketing	746		729		1,537		1,370
Research and development	567		449		1,001		816
General and administrative	984		858		2,385		1,721
Stock-based compensation expense included in expenses	$	2,353	$	2,058	$	5,023	$	3,947

The fair value calculations for stock-based compensation awards to employees for the six months ended March 31, 2019 and 2018 were based on the following assumptions:


	Six Months Ended March 31, 2019	Six Months Ended March 31, 2018
Risk-free interest rate	2.88% – 3.08%	2.04%
Expected life (years)	5.46	5.15
Expected volatility	57%	60%
Expected dividends	None	None

The expected life of options granted is derived using assumed exercise rates based on historical exercise patterns and vesting terms, and represents the period of time that options granted are expected to be outstanding. Expected stock price

volatility is based upon implied volatility and other factors, including historical volatility. After assessing all available information on either historical volatility, or implied volatility, or both, the Company concluded that a combination of both historical and implied volatility provides the best estimate of expected volatility.

As of March 31, 2019, the Company had $21.7 million of unrecognized compensation expense related to outstanding stock options and RSUs expected to be recognized over a weighted-average period of approximately 2.7 years.

2012 Incentive Plan

In January 2012, the Company’s board of directors (the “Board”) adopted the Mitek Systems, Inc. 2012 Incentive Plan (the “2012 Plan”) upon the recommendation of the compensation committee of the Board. On March 10, 2017, the Company’s stockholders approved the amendment and restatement of the 2012 Plan. The total number of shares of Common Stock reserved for issuance under the 2012 Plan is 9,500,000 shares plus that number of shares of Common Stock that would otherwise return to the available pool of unissued shares reserved for awards under its 1999 Stock Option Plan, 2000 Stock Option Plan, 2002 Stock Option Plan, 2006 Stock Option Plan and 2010 Stock Option Plan (collectively, the “Prior Plans”). As of March 31, 2019, (i) stock options to purchase 1,676,413 shares of Common Stock, 2,220,193 RSUs and 1,728,569 Senior Executive Performance RSUs were outstanding under the 2012 Plan, and 676,415 shares of Common Stock were reserved for future grants under the 2012 Plan and (ii) stock options to purchase an aggregate of 541,527 shares of Common Stock were outstanding under the Prior Plans.

Employee Stock Purchase Plan

In January 2018, the Board adopted the ESPP. On March 7, 2018, the Company’s stockholders approved the ESPP. The total number of shares of Common Stock reserved for issuance thereunder is 1,000,000 shares. As of March 31, 2019, (i) 128,342 shares were outstanding under the ESPP and (ii) 871,658 shares of Common Stock were reserved for future purchases under the ESPP. The Company commenced the initial offering period on April 2, 2018.

The ESPP enables eligible employees to purchase shares of Common Stock at a discount from the market price through payroll deductions, subject to limitations. Eligible employees may elect to participate in the ESPP only during an open enrollment period. The offering period immediately follows the open enrollment window, at which time ESPP contributions are withheld from the participant's regular paycheck. The ESPP provides for a 15% discount on the market value of the stock at the lower of the grant date price (first day of the offering period) and the purchase date price (last day of the offering period). The Company recognized $0.1 million and $0.2 million in stock-based compensation expense related to the ESPP in the three and six months ended March 31, 2019, respectively.

Director Restricted Stock Unit Plan

In January 2011, the Board adopted the Mitek Systems, Inc. Director Restricted Stock Unit Plan, as amended and restated (the “Director Plan”). On March 10, 2017, the Company’s stockholders approved an amendment to the Director Plan. The total number of shares of Common Stock reserved for issuance thereunder is 1,500,000 shares. As of March 31, 2019, (i) 366,870 RSUs were outstanding under the Director Plan and (ii) 391,701 shares of Common Stock were reserved for future grants under the Director Plan.

Stock Options

The following table summarizes stock option activity under the Company’s equity plans during the six months ended March 31, 2019:


	Number of Shares	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (in Years)
Outstanding at September 30, 2018	2,806,364	$	4.75	4.6
Granted	364,368	$	9.50
Exercised	(637,051)	$	3.38
Canceled	(143,562)	$	6.62
Outstanding at March 31, 2019	2,390,119	$	5.73	5.3

The Company recognized $0.2 million and $0.3 million in stock-based compensation expense related to outstanding stock options in the three months ended March 31, 2019 and 2018, respectively. The Company recognized $0.4 million and $0.6 million in stock-based compensation expense related to outstanding stock options in the six months ended March 31, 2019

and 2018, respectively. As of March 31, 2019, the Company had $2.1 million of unrecognized compensation expense related to outstanding stock options expected to be recognized over a weighted-average period of approximately 3.3 years.

Aggregate intrinsic value represents the value of the Company’s closing stock price on the last trading day of the fiscal period in excess of the weighted-average exercise price, multiplied by the number of options outstanding and exercisable. The total intrinsic value of options exercised during the six months ended March 31, 2019 and 2018 was $4.8 million and $0.5 million, respectively. The per-share weighted-average fair value of options granted during the six months ended March 31, 2019 was $9.50. The aggregate intrinsic value of options outstanding as of March 31, 2019 and September 30, 2018, was $15.6 million and $8.7 million, respectively.

Restricted Stock Units

The following table summarizes RSU activity under the Company’s equity plans during the six months ended March 31, 2019:


	Number of Shares	Weighted-Average Fair Market Value Per Share
Outstanding at September 30, 2018	2,580,176	$	6.92
Granted	1,069,254	$	9.63
Settled	(682,214)	$	6.00
Canceled	(285,415)	$	6.97
Outstanding at March 31, 2019	2,681,801	$	8.25

The cost of RSUs is determined using the fair value of Common Stock on the award date, and the compensation expense is recognized ratably over the vesting period. The Company recognized $1.6 million and $1.4 million in stock-based compensation expense related to outstanding RSUs in the three months ended March 31, 2019 and 2018, respectively. The Company recognized $3.7 million and $2.6 million in stock-based compensation expense related to outstanding RSUs in the six months ended March 31, 2019 and 2018, respectively. As of March 31, 2019, the Company had $16.4 million of unrecognized compensation expense related to outstanding RSUs expected to be recognized over a weighted-average period of approximately 2.7 years.

Senior Executive Performance RSUs

There were 1,728,569 Senior Executive Performance RSUs outstanding as of March 31, 2019. The Company recognized $0.3 million and $0.4 million in stock-based compensation expense related to outstanding Senior Executive Performance RSUs in the three months ended March 31, 2019 and 2018, respectively. The Company recognized $0.5 million and $0.7 million in stock-based compensation expense related to outstanding Senior Executive Performance RSUs in the six months ended March 31, 2019 and 2018, respectively. As of March 31, 2019, the Company had $1.1 million of unrecognized compensation expense related to outstanding RSUs expected to be recognized over a weighted-average period of approximately 1.4 years.

Performance Options

On November 6, 2018, as an inducement grant pursuant to Nasdaq Listing Rule 5635(c)(4), the Company’s Chief Executive Officer was granted performance options (the “Performance Options”) to purchase up to 800,000 shares of the Common Stock at an exercise price of $9.50 per share, the closing market price for a share of the Common Stock on the date of the grant. As long as he remains employed by the Company, such Performance Options shall vest upon the closing market price of the Common Stock achieving certain predetermined levels and his serving as the Chief Executive Officer of the Company for at least 3.0 years. In the event of a change of control of the Company, all of the unvested Performance Options will vest if the per share price payable to the stockholders of the Company in connection with the Change of Control is an amount reaching those certain predetermined levels required for the Performance Options to otherwise vest. The Company recognized $0.2 million and $0.3 million in stock-based compensation expense related to outstanding Performance Options in the three and six months ended March 31, 2019, respectively. As of March 31, 2019, the Company had $2.1 million of unrecognized compensation expense related to outstanding Performance Options expected to be recognized over a weighted-average period of approximately 2.6 years.

Earnout Shares

On June 17, 2015, the Company completed the acquisition of ID Checker 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, “ID Checker”). In connection with the acquisition of ID Checker, the Company issued 137,306 shares of Common Stock (the “Earnout Shares”) to the Sellers for achievement by ID Checker of certain revenue targets for the nine-month period ended September 30, 2015. Additionally, 81,182 Earnout Shares were earned by the Sellers for achievement by ID Checker of certain revenue targets for the twelve-month period ended September 30, 2016. The Company estimated the fair value of the Earnout Shares using the Monte-Carlo simulation (using the Company’s valuation date stock price, the annual risk-free interest rate, expected volatility, the probability of reaching the performance targets and a 10-trading day average stock price). In November 2017, a contingency triggered the immediate vesting of all Earnout Shares, resulting in an acceleration of all stock-based compensation related to the earnout shares. Stock-based compensation expense related to the Earnout Shares is recorded within acquisition-related costs and expenses on the consolidated statements of operations and other comprehensive income (loss). The company did not recognize any stock-based compensation expense related to the Earnout Shares for the six months ended March 31, 2019. The Company recognized $0.4 million in stock-based compensation expense related to the Earnout Shares for the six months ended March 31, 2018.

Rights Agreement

On October 23, 2018, the Company entered into the Section 382 Rights Agreement (the “Rights Agreement”) and issued a dividend of one preferred share purchase right (a “Right”) for each share of Common Stock payable on November 2, 2018 to the stockholders of record of such shares on that date. Each Right entitles the registered holder, under certain circumstances, to purchase from the Company one one-thousandth of a share of Series B Junior Preferred Stock, par value $0.001 per share (the “Preferred Shares”), of the Company, at a price of $35.00 per one one-thousandth of a Preferred Share represented by a Right, subject to adjustment. The description and terms of the Rights are set forth in the Rights Agreement.

The Rights are not exercisable until the Distribution Date (as defined in the Rights Agreement). Until a Right is exercised, the holder thereof, as such, will have no rights as a stockholder of the Company, including, without limitation, the right to vote or to receive dividends.

At any time prior to the time any person becomes an Acquiring Person (as defined in the Rights Agreement), the Board may redeem the Rights in whole, but not in part, at a price of $0.0001 per Right (the “Redemption Price”). The redemption of the Rights may be made effective at such time, on such basis and with such conditions as the Board in its sole discretion may establish. Immediately upon any redemption of the Rights, the right to exercise the Rights will terminate and the only right of the holders of Rights will be to receive the Redemption Price.

The Rights will expire on the earlier of (i) the close of business on October 22, 2021, (ii) the time at which the Rights are redeemed, and (iii) the time at which the Rights are exchanged.

On February 28, 2019, the Company entered into an Amendment No. 1 to the Rights Agreement for the purpose of (i) modifying the definitions of “Beneficial Owner,” “Beneficially Own,” and “Beneficial Ownership” under the Rights Agreement to more closely align such definitions to the actual and constructive ownership rules under Section 382 of the Internal Revenue Code of 1986, as amended (“Section 382”) or such similar provisions of the Tax Cuts and Jobs Act of 2017 and the rules and regulations promulgated thereunder, and (ii) adding an exemption request process for persons to seek an exemption from becoming an “Acquiring Person” under the Rights Agreement in the event such person wishes to acquire 4.9% or more of the Common Stock then outstanding.

Income Taxes	6 Months Ended
Income Taxes	Mar. 31, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company’s tax provision for interim periods is determined using an estimate of the annual effective tax rate, adjusted for discrete items arising in that quarter. In each quarter, management updates the estimate of the annual effective tax rate, and any changes in the annual effective tax rate are recorded in a cumulative adjustment in that quarter. The quarterly tax provision and quarterly estimate of the annual effective tax rate are subject to significant volatility due to several factors, including management’s ability to accurately predict the portion of loss before income taxes in multiple jurisdictions, the tax effects of our stock-based compensation awards, and the effects of acquisitions and the integration of those acquisitions. The annual effective tax rate differs from the U.S. statutory rate primarily due to state taxes. For the six months ended March 31, 2019, the Company recorded an income tax benefit of $2.1 million, which yielded an effective tax rate of 35%. As the Company has a fiscal year ending September 30th, it is subject to transitional tax rate rules. Therefore, a blended rate of 22.5% was computed as effective for the current fiscal year. The difference between the U.S. federal statutory tax rate and the Company’s effective tax rate for the six months ended March 31, 2019 is primarily due to foreign taxes, state taxes, and the impact of federal and state research and development credits on its tax provision.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Claim Against ICAR On June 11, 2018, a claim was filed before the Juzgado de Primera Instancia number 5 of Barcelona, Spain, the first instance court in the Spanish civil procedure system, against ICAR. The claim, also directed to Mr. Xavier Codó Grasa, former controlling shareholder of ICAR and its current General Manager, was brought by the Spanish company Global Equity & Corporate Consulting, S.L. for the alleged breach by ICAR of a services agreement entered into in the context of the ICAR Acquisition. ICAR responded to the claim on September 7, 2018 and the court process is ongoing, the scheduled date for the trial being April 2, 2020. The amount claimed is €0.8 million (or $0.9 million), plus the interests accrued during the court proceedings. Pursuant and subject to the terms of the sale and purchase agreement concerning the acquisition of the shares in ICAR, Mitek Holding B.V. is to be indemnified in respect of any damages suffered by ICAR and/or Mitek Holding B.V. in respect of this claim. 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. 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. Facility Leases The Company’s principal executive offices, as well as its research and development facility, are located in approximately 29,000 square feet of office space in San Diego, California and the term of the lease for the Company’s offices continues through June 30, 2024. The average annual base rent under this lease is approximately $1.0 million per year. In connection with this lease, the Company received tenant improvement allowances totaling $1.0 million. These lease incentives are being amortized as a reduction of rent expense over the term of the lease. As of March 31, 2019, the unamortized balance of the lease incentives was $0.7 million, of which $0.1 million has been included in other current liabilities and $0.6 million has been included in other non-current liabilities. The offices of A2iA are located in France and New York, New York and the terms of each lease continue through July 31, 2021 and September 30, 2019, respectively, with annual base rent of approximately €0.4 million (or approximately $0.4 million) and approximately $0.3 million per year, respectively. The offices of ID Checker are located in the Netherlands and the term of such lease continues through December 31, 2023 with annual base rent of approximately €0.2 million (or approximately $0.2 million) per year. The Company has a sales office in London, UK. The term of this lease continues through May 31, 2020. The annual base rent under this lease is approximately £63,000 (or approximately $82,000) per year. The offices of ICAR are located in Barcelona, Spain and the term of such lease continues through May 31, 2023 with annual base rent of approximately €0.1 million (or approximately $0.1 million) per year. The Company believes its existing properties are in good condition and are sufficient and suitable for the conduct of its business. Revolving Credit Facility On May 3, 2018, the Company and ID Checker, Inc. (together, the “Co-Borrowers”) entered into a Loan and Security Agreement (the “Loan Agreement”) with Silicon Valley Bank (“SVB”). Pursuant to the Loan Agreement, the Company arranged for a $10.0 million secured revolving credit facility (the “Revolver”) with a floating per annum interest rate equal to the greater of the Wall Street Journal prime rate, plus 0.25%, or 4.5%. The Co-Borrowers must maintain, at all times when any amounts are outstanding under the Revolver, either (i) minimum unrestricted cash at SVB and unused availability on the Revolver of at least $15.0 million and (ii) Adjusted Quick Ratio of 1.75:1.00. In May 2019, the Company and SVB entered into an amendment of the Loan Agreement to extend the maturity of the Revolver to September 30, 2020. There were no borrowings outstanding under the Revolver as of March 31, 2019.

Revenue and Vendor Concentrations	6 Months Ended
Revenue and Vendor Concentrations	Mar. 31, 2019
Risks and Uncertainties [Abstract]
REVENUE AND VENDOR CONCENTRATIONS	REVENUE AND VENDOR CONCENTRATIONS Revenue Concentration For the three months ended March 31, 2019, the Company derived revenue of $6.2 million from two customers, with such customers accounting for 17% and 14% of the Company’s total revenue. For the three months ended March 31, 2018, the Company derived revenue of $5.8 million from two customers, with such customers accounting for 24% and 17% of the Company’s total revenue. For the six months ended March 31, 2019, the Company derived revenue of $6.9 million from one customer, with such customer accounting for 18% of the Company’s total revenue. For the six months ended March 31, 2018, the Company derived revenue of $5.9 million from one customer, with such customer accounting for 22% of the Company’s total revenue. The corresponding accounts receivable balances of customers from which revenues were in excess of 10% of total revenue were $4.7 million and $2.4 million at March 31, 2019 and 2018, respectively. The Company’s revenue is derived primarily from sales 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. These contractual arrangements do not obligate the Company’s channel partners to order, purchase or distribute any fixed or minimum quantities of the Company’s products. 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 several quarters, 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 35% of the Company’s total revenue for both the three and six months ended March 31, 2019. International sales accounted for approximately 23% and 26% of the Company’s total revenue for the six months ended March 31, 2018, respectively. Vendor Concentration The Company purchases its integrated software components from multiple third-party software providers at competitive prices. For the three and six months ended March 31, 2019 and 2018, 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.

Nature of Operations and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations Mitek Systems, Inc. ("Mitek" or the "Company") is a leading innovator of mobile capture and digital identity verification solutions. Mitek is a software development company with expertise in artificial intelligence and machine learning. The Company is currently serving more than 6,500 financial services organizations and leading marketplace and financial technology ("fintech") brands across the globe. The Company's solutions are embedded in native mobile apps and mobile optimized websites to facilitate better mobile user experiences, fraud detection and reduction, and compliant transactions. Mitek's Mobile Deposit® solution is used today by millions of consumers in the United States ("U.S."), Canada, the United Kingdom, and Australia for mobile check deposit. Mobile Deposit® is the category leading product that allows individuals and businesses to remotely deposit checks using their camera-equipped smartphone or tablet. The Company's Mobile Deposit® solution has now processed over three billion check deposits. Mitek began selling Mobile Deposit® in the second fiscal quarter of 2008, and received its first patent issued for this product in August 2010. Mitek’s Mobile Verify™ is an important technology used to verify people’s identities at the point of onboarding via web or mobile device. Scanning an identity document enables an enterprise to identify the person with whom they are conducting business, comply with growing governmental Know Your Customer and Anti-Money Laundering ("AML") regulatory requirements, and to improve the overall customer experience for digital onboarding. To be sure the person submitting the identity document is who they say they are, Mitek's Mobile Verify Face Comparison provides an incremental layer of verification and compares the face on the identity document with the selfie photo of the user. Mitek's Mobile Verify Face Comparison technology uses advanced liveness detection so it cannot be spoofed. The identification capture process provided by Mitek can also provide prefill of much of the data obtained from the identity document into an application, requiring far fewer key strokes, reducing keying errors, and improving both operational efficiency and the customer experience. Today, the financial services verticals (banks, credit unions, lenders, payments processors, card issuers, fintech companies, etc.) represent the greatest percentage of use of the Company's solutions, but marketplaces, sharing economy, telecommunications, healthcare, travel, and retail sectors are showing accelerated adoption. Similarly, websites that must verify the customer’s age (or other consumer information) prior to selling goods can do so by verifying identity documents. Mitek uses machine learning to constantly improve the product performance of Mobile Verify™ and applies artificial intelligence to increase automation and speed of approvals of identification documents. The core of the Company's user experience is Mitek MiSnap™, a touch-free automated capture technology which can be incorporated across product lines. It provides a simple and superior user-experience, making transactions on mobile devices fast, accurate, and easy for the consumer while helping organizations drive revenue from the increasingly popular mobile channel. Mobile Fill™, Mitek's mobile identity capture solution, enables the camera to serve as a keyboard. Using Mobile Fill™, consumers can quickly prefill any form with personal data by simply snapping a picture of their driver's license, credit card, or other similar identity document. CheckReader™, which the Company acquired through the acquisition of A2iA (as defined below), enables financial institutions to automatically extract data from a check image received across all deposit channels – branch, ATM, Remote Deposit Capture, and mobile. Through the automatic recognition of all fields on checks, whether handwritten or machine print, CheckReader™ speeds the time to deposit for banks and customers and reduces costs formerly incurred before images could be exchanged. ID_CLOUD™ is a fully automated identity verification solution that can be integrated into a customer’s application to instantly read and validate identity documents. ID_CLOUD™ automated technology enables global enterprises to improve their customer acquisition technology while meeting AML requirements in a safe and cost-effective manner. This solution is available in the cloud, and via mobile websites and desktop applications. Additionally, a version of ID_CLOUD™ is available that works locally on a desktop that is connected to a proprietary hardware scanner for reading and validating identity documents. The Company markets and sells its products and services worldwide through internal, direct sales teams located in the U.S., Europe, and Latin America as well as through channel partners. The Company's partner sales strategy includes channel partners who are financial services technology providers and identity verification providers. These partners integrate the Company's products into their solutions to meet the needs of their customers. As of March 31, 2019, the Company has been granted 50 patents and it has an additional 20 patent applications pending.
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements of the Company as of March 31, 2019 have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X and, accordingly, they do not include all information and footnote disclosures required by accounting principles generally accepted in the U.S. (“GAAP”). The Company believes the footnotes and other disclosures made in the financial statements are adequate for a fair presentation of the results of the interim periods presented. The financial statements include all adjustments (solely of a normal recurring nature) which are, in the opinion of management, necessary to make the information presented not misleading. Certain reclassifications were made to previously reported amounts in the consolidated statements of cash flows to make them consistent with the current period presentation. You should read these financial statements and the accompanying notes in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2018, filed with the U.S. Securities and Exchange Commission on December 14, 2018. Results for the three months ended March 31, 2019 are not necessarily indicative of results for any other interim period or for a full fiscal year.
Principles of Consolidation	Principles of ConsolidationThe consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Foreign Currency	Foreign CurrencyThe Company has foreign subsidiaries that operate and sell products and services in various countries and jurisdictions around the world. As a result, the Company is exposed to foreign currency exchange risks. For those subsidiaries whose functional currency is not the U.S. dollar, assets and liabilities are translated into U.S. dollars 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 loss in the consolidated balance sheets.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, expenses, deferred taxes, and related disclosure of contingent assets and liabilities. On an ongoing basis, management reviews its estimates based upon currently available information. Actual results could differ materially from those estimates. These estimates include, but are not limited to, assessing the collectability of accounts receivable, estimation of the value of stock-based compensation awards, fair value of assets and liabilities acquired, impairment of goodwill, useful lives of intangible assets, standalone selling price related to revenue recognition, contingent consideration, and income taxes.
Revenue Recognition	Revenue Recognition The Company recognizes revenue in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers, and its related amendments (collectively known as “ASC 606”). ASC 606 outlines a single comprehensive model to use in accounting for revenue arising from contracts with customers. The core principle, involving a five-step process, of the revenue model is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company generates revenue primarily from the delivery of licenses (to both on premise and transactional software as a service ("SaaS") products) and related services, as well as the delivery of hardware and professional services. Revenue is measured based on consideration specified in a contract with a customer. The Company recognizes revenue when it satisfies a performance obligation by transferring control over a product or service to a customer which may be at a point in time or over time. See Note 2 of the consolidated financial statements for additional details.
Net Loss Per Share	Net Loss Per Share The Company calculates net loss per share in accordance with FASB ASC Topic 260, Earnings per Share. Basic net loss per share is based on the weighted-average number of common shares outstanding during the period. Diluted net loss per share also gives effect to all potentially dilutive securities outstanding during the period, such as restricted stock units (“RSUs”), stock options, and Employee Stock Purchase Plan (“ESPP”) shares, 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.
Investments	Investments Investments consist of corporate notes and bonds, commercial paper, and U.S. Treasury securities. The Company classifies investments as available-for-sale at the time of purchase and reevaluates such classification as of each balance sheet date. All investments are recorded at estimated fair value. Unrealized gains and losses for available-for-sale securities are included in accumulated other comprehensive loss, 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, net in the consolidated statements of operations and other comprehensive loss. No other-than-temporary impairment charges were recognized in the three and six months ended March 31, 2019 and 2018. All investments whose maturity or sale is expected within one year are classified as “current” on the consolidated balance sheets. All other securities are classified as “long-term” on the consolidated balance sheets.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful AccountsTrade 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.
Capitalized Software Development Costs	Capitalized Software Development Costs Costs incurred for the development of software that will be sold, leased, or otherwise marketed are capitalized when technological feasibility has been established. Software development costs consist primarily of compensation of development personnel and related overhead incurred to develop new products and upgrade and enhance the Company’s current products, as well as fees paid to outside consultants. Capitalization of software development costs ceases, and amortization of capitalized software development costs commences when the products are available for general release. The Company capitalized $0.1 million of software development costs during the six months ended March 31, 2019. For the six months ended March 31, 2018, no software development costs were capitalized because the time period and costs incurred between technological feasibility and general release for all software product releases were not material or were not realizable. We had no amortization expense from capitalized software costs during the six months ended March 31, 2019 and 2018. Costs related to software acquired, developed, or modified solely to meet our internal requirements, with no substantive plans to market such software at the time of development, are capitalized. Costs incurred during the preliminary planning and evaluation stage of the project and during post implementation operational stage are expensed as incurred. Costs incurred during the application development stage of the project are capitalized. The Company defines the design, configuration, and coding process as the application development stage.
Goodwill and Purchased Intangible Assets	Goodwill and Purchased Intangible Assets The Company’s goodwill and intangible assets resulted from prior acquisitions. 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 350”), the Company reviews its goodwill and indefinite-lived intangible assets 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. No such events or circumstances have occurred since the last impairment assessment was performed. 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 350 and ASC Topic 280, Segment Reporting, 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 believes this represents the best evidence of fair value. In the fourth quarter of fiscal 2018, management completed its annual goodwill impairment test and concluded that the Company’s goodwill was not impaired. The Company’s conclusion that goodwill was not impaired was based on a comparison of its net assets to its market capitalization. Because the Company determines the fair value of its reporting unit based on its market capitalization, the Company’s future reviews of goodwill for impairment may be impacted by changes in the price of the Company’s common stock, par value $0.001 per share (“Common Stock”). For example, a significant decline in the price of the Common Stock may cause the fair value of its goodwill to fall below its carrying value. Therefore, the Company cannot assure that when it completes its future reviews of goodwill for impairment a material impairment charge will not be recorded. Intangible assets are amortized over their useful lives. Each period, the Company evaluates the estimated remaining useful life of its intangible assets and whether events or changes in circumstances warrant a revision to the remaining period of amortization. The carrying amounts of these assets are periodically reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. Recoverability of these assets is measured by comparing the carrying amount of each asset to the future undiscounted cash flows the asset is expected to generate. The carrying amount of such assets is reduced to fair value if the undiscounted cash flows used in the test for recoverability are less than the carrying amount of such assets.
Income Taxes	Income Taxes The Company accounts for income taxes in accordance with FASB ASC Topic 740, Income Taxes. 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 7 of the consolidated financial statements 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.
Stock-Based Compensation	Stock-Based Compensation The Company issues RSUs, stock options, performance options, and Senior Executive Long Term Incentive Restricted Stock Units (“Senior Executive Performance RSUs”) as awards to its employees. Additionally, eligible employees may participate in the Company’s ESPP. Employee stock awards are measured at fair value on the date of grant and expense is recognized using the straight-line single-option method in accordance with FASB ASC Topic 718, Compensation-Stock Compensation. Forfeitures are recorded as they occur. The Company assigns fair value to RSUs based on the closing stock price on the date of grant. The Company estimates the fair value of stock options and ESPP shares 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 Company estimates the fair value of Senior Executive Performance RSUs, performance options, and similar awards using the Monte-Carlo simulation. The Monte-Carlo simulation requires subjective assumptions, including the Company’s valuation date stock price, the annual risk-free interest rate, expected volatility, the probability of reaching the performance targets, and a 20-trading-day average stock price.
Guarantees	Guarantees In the ordinary course of business, the Company is not subject to potential obligations under guarantees that fall within the scope of FASB ASC Topic 460, Guarantees (“ASC 460”), except for standard indemnification and warranty provisions that are contained within many of the Company’s customer license and service agreements and certain supplier agreements, and give rise only to the disclosure requirements prescribed by ASC 460. Indemnification and warranty provisions contained within the Company’s customer license and service agreements and certain supplier agreements are generally consistent with those prevalent in the Company’s industry. The Company has not historically incurred significant obligations under customer indemnification or warranty provisions and does not expect to incur significant obligations in the future. Accordingly, the Company does not maintain accruals for potential customer indemnification or warranty-related obligations.
Comprehensive Loss	Comprehensive Loss Comprehensive loss consists of net loss, unrealized gains and losses on available-for-sale securities, and foreign currency translation adjustments.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In October 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”), which eliminates the current prohibition on immediate recognition of the current and deferred income tax effects of intra-entity transfers of assets other than inventory, with the intent of reducing complexity and diversity in practice. Under ASU 2016-16, entities must recognize the income tax consequences when the transfer occurs rather than deferring recognition. For public entities, ASU 2016-16 is effective for fiscal years, including interim periods within those fiscal years, beginning after December 15, 2017. Entities must apply the guidance on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The Company adopted ASU 2016-16 in the first quarter of 2019, and the adoption did not have a material impact on its consolidated financial statements. In May 2014, the FASB issued guidance codified in ASC 606, to replace existing revenue recognition rules with a single comprehensive model to use in accounting for revenue arising from contracts with customers. Under ASC 606, revenue is recognized when a customer obtains control of promised goods or services for an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. In addition, ASC 606 requires expanded disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The Company adopted ASC 606 on October 1, 2018 for all contracts that were not completed as of the adoption date using the modified retrospective method and the practical expedient was not applied. The Company recognized the cumulative effect of initially applying the new revenue standard as an adjustment to the opening balance of accumulated deficit. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The Company expects the impact of the adoption of the new revenue standard to be immaterial to our net income on an ongoing basis. See Note 2 of the consolidated financial statements for additional details on the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (ASC 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract ("ASU 2018-15"), which requires hosting arrangements that are service contracts to follow the guidance for internal-use software to determine which implementation costs can be capitalized. ASU 2018-15 is effective either prospectively or retrospectively for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. The Company does not expect the adoption of ASU 2018-15 to have a material impact on its consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement, to eliminate, add, and modify certain disclosure requirements for fair value measurements. Entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but public companies will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The guidance is effective for annual and interim periods beginning after December 15, 2019, but entities are permitted to early adopt either the entire standard or only the provisions that eliminate or modify the requirements. The Company is currently evaluating how to apply the new guidance. In February 2018, the FASB issued ASU No. 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”). Under previously existing GAAP, the effects of changes in tax rates and laws on deferred tax balances are recorded as a component of income tax expense in the period in which the law was enacted. When deferred tax balances related to items originally recorded in accumulated other comprehensive income are adjusted, certain tax effects become stranded in accumulated other comprehensive income. The amendments in ASU 2018-02 allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The amendments in this ASU also require certain disclosures about stranded tax effects. The guidance is required for fiscal years beginning after December 15, 2018 (our fiscal year 2020), and interim periods within those fiscal years. Early adoption in any period is permitted. The Company does not expect the adoption of ASU 2018-02 to have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”), which eliminates Step 2 of the goodwill impairment test that had required a hypothetical purchase price allocation. Rather, entities should apply the same impairment assessment to all reporting units and recognize an impairment loss for the amount by which a reporting unit’s carrying amount exceeds its fair value, without exceeding the total amount of goodwill allocated to that reporting unit. Entities will continue to have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 will be effective prospectively for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. The Company does not expect the adoption of ASU 2017-04 to have a material impact on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), which requires entities to use a Current Expected Credit Loss model which is a new impairment model based on expected losses rather than incurred losses. Under this model, an entity would recognize an impairment allowance equal to its current estimate of all contractual cash flows that the entity does not expect to collect from financial assets measured at amortized cost. The entity’s estimate would consider relevant information about past events, current conditions and reasonable and supportable forecasts. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 31, 2019 with early adoption permitted for annual reporting periods beginning after December 31, 2018. The Company is currently evaluating the impact ASU 2016-13 will have on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which modified lease accounting for both lessees and lessors to increase transparency and comparability by recognizing lease assets and lease liabilities by lessees for those leases classified as operating leases under previous accounting standards and disclosing key information about leasing arrangements. ASU 2016-02 will be effective for the Company beginning in its first quarter of fiscal 2020 and early adoption is permitted. The Company is currently evaluating the impact of adopting the new lease standard on its consolidated financial statements. No other new accounting pronouncement issued or effective during the three months ended March 31, 2019 had, or is expected to have, a material impact on the Company’s consolidated financial statements.

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

6 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Schedule of Potentially Dilutive Common Shares Excluded from Calculation of Net Loss per Share


	Three Months Ended March 31,			Six Months Ended March 31,
	2019	2018	2019	2018
Stock options	2,390	3,047	2,390	3,047
RSUs	2,682	2,670	2,682	2,670
ESPP common stock equivalents	65	—	65	—


Total potentially dilutive common shares outstanding	5,137	5,717	5,137	5,717

Schedule of Calculation of Basic and Diluted Net Loss Per Share

The calculation of basic and diluted net loss per share is as follows (amounts in thousands, except per share data):


	Three Months Ended March 31,						Six Months Ended March 31,
	2019		2018		2019		2018
Net loss	$	(716)	$	(1,160)	$	(3,907)	$	(6,896)
Weighted-average shares outstanding—basic	38,926		34,976		38,583		34,587
Common stock equivalents	—		—		—		—
Weighted-average shares outstanding—diluted	38,926		34,976		38,583		34,587
Net loss per share:
Basic	$	(0.02)	$	(0.03)	$	(0.10)	$	(0.20)
Diluted	$	(0.02)	$	(0.03)	$	(0.10)	$	(0.20)

Schedule of Cumulative Effect of Adoption of ASC 606 on Consolidated Financial Statements

The following table summarizes the cumulative effect of the changes made to the consolidated balance sheet as of October 1, 2018 due to the adoption of ASC 606 (amounts in thousands):


	Balance at September 30, 2018		Adjustments Due to the Adoption of ASC 606		Balance at October 1, 2018
Assets
Other current assets	$	1,053	$	169	$	1,222
Deferred income tax asset	15,356		(267)		15,089
Other non-current assets	2,147		507		2,654

Liabilities
Deferred revenue, current portion	4,792		(511)		4,281
Deferred revenue, non-current portion	485		—		485

Equity
Accumulated deficit	$	(21,002)	$	920	$	(20,082)


Consolidated Statement of Operations
	Impact of changes in accounting policies
Three Months Ended March 31, 2019:	As reported		Adjustments		Balances without adoption of ASC 606
Revenue
Software and hardware	$	10,585	$	(581)	$	10,004
Service and other	9,398		—		9,398
Total revenue	19,983		(581)		19,402

Operating expenses
Selling and marketing	$	6,752	$	(1)	$	6,751

	Impact of changes in accounting policies
Six Months Ended March 31, 2019:	As reported		Adjustments		Balances without adoption of ASC 606
Revenue
Software and hardware	$	20,580	$	(1,271)	$	19,309
Service and other	17,086		—		17,086
Total revenue	37,666		(1,271)		36,395

Operating expenses
Selling and marketing	$	13,960	$	10	$	13,970


Consolidated Balance Sheet
	Impact of changes in accounting policies
March 31, 2019:	As reported		Adjustments		Balances without adoption of ASC 606
Assets
Other current assets	$	2,600	$	(1,012)	$	1,588
Deferred income tax asset	17,580		555		18,135
Other non-current assets	2,410		(10)		2,400

Liabilities
Deferred revenue, current portion	7,973		1,210		9,183
Deferred revenue, non-current portion	516		—		516

Equity
Accumulated deficit	$	(23,989)	$	(1,677)	$	(25,666)

Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

The following table presents the Company's revenue disaggregated by major product category (amounts in thousands):


	Three Months Ended March 31,						Six Months Ended March 31,
	2019		2018		2019		2018
Major product category
Deposits software and hardware	$	9,215	$	6,735	$	18,265	$	11,882
Deposits services and other	3,693		1,876		6,513		3,830
Deposits revenue	12,908		8,611		24,778		15,712
Identity verification software and hardware	1,370		2,038		2,315		4,097
Identity verification services and other	5,705		3,628		10,573		6,604
Identity verification revenue	7,075		5,666		12,888		10,701
Total revenue	19,983		14,277		37,666		26,413

Schedule of Contract Balances

The following table provides information about contract assets and contract liabilities from contracts with customers (amounts in thousands):


	March 31, 2019		October 1, 2018
Contract assets, current	$	1,021	$	169
Contract assets, non-current	—		507
Contract liabilities, current	7,973		4,792
Contract liabilities, non-current	$	516	$	485

Business Combinations (Tables)

6 Months Ended

Mar. 31, 2019

Business Combinations [Abstract]

Schedule of Estimated Fair Values of the Assets Acquired and Liabilities Assumed as Part of a Business Acquisition

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed during the year ended September 30, 2018 (amounts shown in thousands):


	A2iA		ICAR		Total
Current assets	$	3,929	$	2,036	$	5,965
Property, plant, and equipment	307		83		390
Intangible assets	28,610		6,407		35,017
Goodwill	24,991		6,936		31,927
Other non-current assets	1,177		87		1,264
Current liabilities	(2,688)		(1,652)		(4,340)
Deferred income tax liabilities	(7,503)		(1,602)		(9,105)
Other non-current liabilities	(7)		(828)		(835)
Net assets acquired	$	48,816	$	11,467	$	60,283

Schedule of Intangible Assets Acquired

The following table summarizes the estimated fair values

and estimated useful lives of intangible assets with definite lives acquired during the year ended September 30, 2018 (amounts shown in thousands, except for years):


	Amortization Period	Amount assigned
A2iA
Completed technologies	7.0 years	$	13,015
Customer relationships	5.0 years	15,360
Trade names	5.0 years	235
Total intangible assets acquired from A2iA		$	28,610

ICAR
Completed technologies	5.0 years	$	4,956
Customer relationships	2.0 years	1,298
Trade names	3.0 years	153
Total intangible assets acquired from ICAR		$	6,407

Schedule of Pro Forma Information

The following table summarizes the Company’s unaudited pro forma financial information presented as if the acquisitions occurred on October 1, 2017 (amounts shown in thousands):


	Three Months Ended March 31,						Six Months Ended March 31,
	2019		2018		2019		2018
Pro forma revenue	$	20,192	$	19,653	$	39,089	$	36,974
Pro forma net loss	$	(658)	$	(1,086)	$	(2,638)	$	(7,061)

Investments (Tables)

6 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments by Type of Security

The following tables summarize investments by type of security as of March 31, 2019 and September 30, 2018, respectively (amounts shown in thousands):


March 31, 2019:	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Market Value
Available-for-sale securities:

Corporate debt securities, short-term	$	5,862	$	—	$	(1)	$	5,861
Total	$	5,862	$	—	$	(1)	$	5,861


September 30, 2018:	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Market Value
Available-for-sale securities:
U.S. Treasury, short-term	$	3,693	$	—	$	(10)	$	3,683
Corporate debt securities, short-term	4,779		—		(14)		4,765
Total	$	8,472	$	—	$	(24)	$	8,448

Schedule of Fair Value of Investments Measured on Recurring Basis


March 31, 2019:	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Short-term investments:

Corporate debt securities
Financial	$	349	$	—	$	349	$	—
Industrial	1,298		—		1,298		—
Commercial paper
Financial	2,922		—		2,922		—
Industrial	1,292		—		1,292		—
Total assets at fair value	$	5,861	$	—	$	5,861	$	—
Liabilities:
Acquisition-related contingent consideration	1,162		—		—		1,162
Total liabilities at fair value	$	1,162	$	—	$	—	$	1,162


September 30, 2018:	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Short-term investments:
U.S. Treasury	$	3,683	$	3,683	$	—	$	—
Corporate debt securities
Financial	2,847		—		2,847		—
Industrial	1,918		—		1,918		—
Total assets at fair value	$	8,448	$	3,683	$	4,765	$	—
Liabilities:
Acquisition-related contingent consideration	3,051		—		—		3,051
Total liabilities at fair value	3,051		—		—		3,051

Schedule of Contingent Consideration Measured at Fair Value

The following table includes a summary of the contingent consideration measured at fair value using significant unobservable inputs (Level 3) during the six months ended March 31, 2019 (amounts shown in thousands):


Balance at September 30, 2018	$	3,051


Payment of contingent consideration	(1,818)

Foreign currency effect on contingent consideration	(71)
Balance at March 31, 2019	$	1,162

Goodwill and Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table summarizes changes in the balance of goodwill during the six months ended March 31, 2019 (amounts shown in thousands):


Balance at September 30, 2018	$	34,407
A2iA purchase accounting adjustment	121
Foreign currency effect on goodwill	(1,088)
Balance at March 31, 2019	$	33,440

Schedule of Intangible Assets

Intangible assets as of March 31, 2019 and September 30, 2018, respectively, are summarized as follows (amounts shown in thousands, except for years):


March 31, 2019:	Weighted Average Amortization Period	Cost		Accumulated Amortization		Net
Completed technologies	6.4 years	$	20,341	$	5,202	$	15,139
Customer relationships	4.8 years	17,628		4,615		13,013
Trade names	4.5 years	618		302		316
Total intangible assets		$	38,587	$	10,119	$	28,468


September 30, 2018:	Weighted Average Amortization Period	Cost		Accumulated Amortization		Net
Completed technologies	6.4 years	$	20,341	$	3,070	$	17,271
Customer relationships	4.8 years	17,628		2,351		15,277
Trade names	4.5 years	618		219		399
Total intangible assets		$	38,587	$	5,640	$	32,947

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
2019 (remaining six months)	$	3,502
2020	6,400
2021	6,134
2022	5,739
2023	3,766
2024	1,779
Thereafter	1,148
Total	$	28,468

Stockholders' Equity (Tables)

6 Months Ended

Mar. 31, 2019

Equity [Abstract]

Schedule of Stock-Based Compensation Expense Related to Stock Options and RSUs

The following table summarizes stock-based compensation expense related to RSUs, stock options, and ESPP shares, which was allocated as follows (amounts shown in thousands):


	Three Months Ended March 31,						Six Months Ended March 31,
	2019		2018		2019		2018
Cost of revenue	$	56	$	22	$	100	$	40
Selling and marketing	746		729		1,537		1,370
Research and development	567		449		1,001		816
General and administrative	984		858		2,385		1,721
Stock-based compensation expense included in expenses	$	2,353	$	2,058	$	5,023	$	3,947

Schedule of Fair Value Calculations for Stock-Based Compensation Awards

The fair value calculations for stock-based compensation awards to employees for the six months ended March 31, 2019 and 2018 were based on the following assumptions:


	Six Months Ended March 31, 2019	Six Months Ended March 31, 2018
Risk-free interest rate	2.88% – 3.08%	2.04%
Expected life (years)	5.46	5.15
Expected volatility	57%	60%
Expected dividends	None	None

Schedule of Stock Option Activity

The following table summarizes stock option activity under the Company’s equity plans during the six months ended March 31, 2019:


	Number of Shares	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (in Years)
Outstanding at September 30, 2018	2,806,364	$	4.75	4.6
Granted	364,368	$	9.50
Exercised	(637,051)	$	3.38
Canceled	(143,562)	$	6.62
Outstanding at March 31, 2019	2,390,119	$	5.73	5.3

Schedule of RSU Activity

The following table summarizes RSU activity under the Company’s equity plans during the six months ended March 31, 2019:


	Number of Shares	Weighted-Average Fair Market Value Per Share
Outstanding at September 30, 2018	2,580,176	$	6.92
Granted	1,069,254	$	9.63
Settled	(682,214)	$	6.00
Canceled	(285,415)	$	6.97
Outstanding at March 31, 2019	2,681,801	$	8.25

Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2019 USD ($) institution patent deposit $ / shares	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) segment patent institution deposit $ / shares	Mar. 31, 2018 USD ($)	Sep. 30, 2018 USD ($) $ / shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of financial institutions signed agreements to deploy mobile deposit (more than) \| institution	6,500		6,500
Number of check deposits processed (more than) \| deposit	3,000,000,000		3,000,000,000
Number of patents granted \| patent	50		50
Number of pending patent applications \| patent	20		20
Net (loss) gain resulting from exchange translation	$ (1,203,000)	$ 403,000	$ (2,027,000)	$ 592,000
Other-than-temporary impairment charges recognized	0	0	0	0
Write-offs of allowance for doubtful accounts	100,000	0	100,000	0
Allowance for doubtful accounts receivable	200,000		200,000		$ 300,000
Capitalized software development costs	100,000	0	100,000	0
Amortization expense of capitalized software development costs	0	0	0	0
Capitalized software development costs for internal use			100,000	300,000
Amortization expense from capitalized software development costs for internal use	$ 200,000	$ 0	$ 200,000	$ 0
Number of operating segments \| segment			1
Number of reporting units \| segment			1
Goodwill impairment
Common stock, par value (in dollars per share) \| $ / shares	$ 0.001		$ 0.001		$ 0.001
Trading-day average stock price period			20 days
Accumulated other comprehensive loss	$ 2,594,000		$ 2,594,000		$ 586,000
Minimum \| ICAR \| Spanish Government Agencies
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of loan agreement			5 years
Amount outstanding under loan agreement	500,000		$ 500,000		800,000
Minimum \| ICAR \| Spanish Government Agencies \| Other current liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amount outstanding under loan agreement	100,000		100,000		300,000
Minimum \| ICAR \| Spanish Government Agencies \| Other non-current liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amount outstanding under loan agreement	$ 400,000		$ 400,000		$ 500,000
Maximum \| ICAR \| Spanish Government Agencies
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of loan agreement			12 years
Interest rate on loan agreement	0.00%		0.00%

Nature of Operations and Summary of Significant Accounting Policies - Potentially Dilutive Common Shares Excluded from Calculation of Net Loss per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding (in shares)	5,137	5,717	5,137	5,717
Stock options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding (in shares)	2,390	3,047	2,390	3,047
RSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding (in shares)	2,682	2,670	2,682	2,670
ESPP common stock equivalents
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total potentially dilutive common shares outstanding (in shares)	65	0	65	0

Nature of Operations and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Net loss	$ (716)	$ (1,160)	$ (3,907)	$ (6,896)
Weighted-average shares outstanding - basic (in shares)	38,926	34,976	38,583	34,587
Common stock equivalents (in shares)	0	0	0	0
Weighted-average shares outstanding - diluted (in shares)	38,926	34,976	38,583	34,587
Net loss per share:
Basic (in dollars per share)	$ (0.02)	$ (0.03)	$ (0.10)	$ (0.20)
Diluted (in dollars per share)	$ (0.02)	$ (0.03)	$ (0.10)	$ (0.20)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Nature of Operations and Summary of Significant Accounting Policies - Cumulative Effect of Adoption of ASC 606 on Consolidated Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Oct. 01, 2018	Sep. 30, 2018
Assets
Other current assets	$ 2,600		$ 2,600			$ 1,053
Deferred income tax assets, net	17,580		17,580			15,356
Other non-current assets	2,410		2,410			2,147
Liabilities
Deferred revenue, current portion	7,973		7,973			4,792
Deferred revenue, non-current portion	516		516			485
Equity
Accumulated deficit	(23,989)		(23,989)			(21,002)
Revenue
Total revenue	19,983	$ 14,277	37,666	$ 26,413
Operating expenses
Selling and marketing	6,752	5,348	13,960	10,123
Software and hardware
Revenue
Total revenue	10,585	8,773	20,580	15,979
Service and other
Revenue
Total revenue	9,398	$ 5,504	17,086	$ 10,434
Adjustments Due to the Adoption of ASC 606 \| ASU 2014-09
Assets
Other current assets	(1,012)		(1,012)			169
Deferred income tax assets, net	555		555			(267)
Other non-current assets	(10)		(10)			507
Liabilities
Deferred revenue, current portion	1,210		1,210			(511)
Deferred revenue, non-current portion	0		0			0
Equity
Accumulated deficit	(1,677)		(1,677)			$ 920
Revenue
Total revenue	(581)		(1,271)
Operating expenses
Selling and marketing	(1)		10
Adjustments Due to the Adoption of ASC 606 \| ASU 2014-09 \| Software and hardware
Revenue
Total revenue	(581)		(1,271)
Adjustments Due to the Adoption of ASC 606 \| ASU 2014-09 \| Service and other
Revenue
Total revenue	0		0
Balances without adoption of ASC 606
Assets
Other current assets	1,588		1,588		$ 1,222
Deferred income tax assets, net	18,135		18,135		15,089
Other non-current assets	2,400		2,400		2,654
Liabilities
Deferred revenue, current portion	9,183		9,183		4,281
Deferred revenue, non-current portion	516		516		485
Equity
Accumulated deficit	(25,666)		(25,666)		$ (20,082)
Revenue
Total revenue	19,402		36,395
Operating expenses
Selling and marketing	6,751		13,970
Balances without adoption of ASC 606 \| Software and hardware
Revenue
Total revenue	10,004		19,309
Balances without adoption of ASC 606 \| Service and other
Revenue
Total revenue	$ 9,398		$ 17,086

Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 19,983	$ 14,277	$ 37,666	$ 26,413
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	12,908	8,611	24,778	15,712
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	7,075	5,666	12,888	10,701
Transferred at Point in Time \| Deposits software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	9,215	6,735	18,265	11,882
Transferred at Point in Time \| Identity verification software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	1,370	2,038	2,315	4,097
Transferred over Time \| Deposits services and other
Disaggregation of Revenue [Line Items]
Total revenue	3,693	1,876	6,513	3,830
Transferred over Time \| Identity verification services and other
Disaggregation of Revenue [Line Items]
Total revenue	$ 5,705	$ 3,628	$ 10,573	$ 6,604

Revenue Recognition - Contract Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Oct. 01, 2018	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Contract assets, current	$ 1,021	$ 169
Contract assets, non-current	0	507
Contract liabilities, current	7,973	4,792	$ 4,792
Contract liabilities, non-current	$ 516	$ 485	$ 485

Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2019	Oct. 01, 2018
Disaggregation of Revenue [Line Items]
Revenue recognized included in contract liability balance at the beginning of the period		$ 3,600,000
Impairment losses recognized on capitalized contract costs	$ 0	0
Selling and marketing
Disaggregation of Revenue [Line Items]
Amortization of capitalized contract costs	100,000	200,000
Other Current and Non-current Assets
Disaggregation of Revenue [Line Items]
Capitalized contract costs	$ 1,400,000	$ 1,400,000	$ 1,000,000.0

Business Combinations - Additional Information (Details) - USD ($) $ in Thousands					1 Months Ended	6 Months Ended
	May 23, 2018	May 03, 2018	Apr. 30, 2018	Oct. 16, 2017	Jan. 31, 2019	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Payment to acquired business, net of cash acquired						$ 0	$ 2,991
Acquisition-related contingent consideration						1,162		$ 3,051
Payment of acquisition-related contingent consideration						$ 1,029	$ 0
A2iA
Business Acquisition [Line Items]
Payment to acquired business, net of cash acquired	$ 26,800
Stock issued during acquisition (in shares)	2,514,588
Common stock issued during acquisition, value		$ 21,900
Transaction-related liabilities	$ 200
Business acquisition, transaction costs	2,200
Payments of cash for collateral	$ 700
Payments for collateral, equity, shares	508,479
Payments for collateral, equity, value	$ 4,400
Period to maintain escrow deposit	24 months
ICAR
Business Acquisition [Line Items]
Payment to acquired business, net of cash acquired				$ 3,000
Stock issued during acquisition (in shares)				584,291
Common stock issued during acquisition, value				$ 5,600
Business acquisition, transaction costs				500
Period to maintain escrow deposit			24 months
Acquisition-related contingent consideration				2,900
Escrow deposit			$ 1,500	1,500
ICAR \| Q4 Consideration
Business Acquisition [Line Items]
Contingent consideration arrangement, range of outcomes, high				1,500
ICAR \| Earnout Consideration
Business Acquisition [Line Items]
Contingent consideration arrangement, range of outcomes, high				$ 3,800
Payment of acquisition-related contingent consideration					$ 1,800

Business Combinations - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Goodwill	$ 33,440	$ 34,407
A2iA
Business Acquisition [Line Items]
Current assets		3,929
Property, plant, and equipment		307
Intangible assets		28,610
Goodwill		24,991
Other non-current assets		1,177
Current liabilities		(2,688)
Deferred income tax liabilities		(7,503)
Other non-current liabilities		(7)
Net assets acquired		48,816
ICAR
Business Acquisition [Line Items]
Current assets		2,036
Property, plant, and equipment		83
Intangible assets		6,407
Goodwill		6,936
Other non-current assets		87
Current liabilities		(1,652)
Deferred income tax liabilities		(1,602)
Other non-current liabilities		(828)
Net assets acquired		11,467
Total
Business Acquisition [Line Items]
Current assets		5,965
Property, plant, and equipment		390
Intangible assets		35,017
Goodwill		31,927
Other non-current assets		1,264
Current liabilities		(4,340)
Deferred income tax liabilities		(9,105)
Other non-current liabilities		(835)
Net assets acquired		$ 60,283

Business Combinations - Schedule of Intangible Assets Acquired (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2019	Sep. 30, 2018
Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period	4 years 9 months 18 days	4 years 9 months 18 days
A2iA
Acquired Indefinite-lived Intangible Assets [Line Items]
Amount assigned			$ 28,610
A2iA \| Completed technologies
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period			7 years
Amount assigned			$ 13,015
A2iA \| Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period			5 years
Amount assigned			$ 15,360
A2iA \| Trade names
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period			5 years
Amount assigned			$ 235
ICAR
Acquired Indefinite-lived Intangible Assets [Line Items]
Amount assigned			$ 6,407
ICAR \| Completed technologies
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period			5 years
Amount assigned			$ 4,956
ICAR \| Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period			2 years
Amount assigned			$ 1,298
ICAR \| Trade names
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period			3 years
Amount assigned			$ 153

Business Combinations - Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Business Combinations [Abstract]
Pro forma revenue	$ 20,192	$ 19,653	$ 39,089	$ 36,974
Pro forma net loss	$ (658)	$ (1,086)	$ (2,638)	$ (7,061)

Investments - Summary of Investments by Type of Security (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Schedule Of Available For Sale Securities [Line Items]
Cost	$ 5,862	$ 8,472
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(24)
Fair Market Value	5,861	8,448
Short-term investments \| U.S. Treasury
Schedule Of Available For Sale Securities [Line Items]
Cost		3,693
Gross Unrealized Gains		0
Gross Unrealized Losses		(10)
Fair Market Value		3,683
Short-term investments \| Corporate debt securities
Schedule Of Available For Sale Securities [Line Items]
Cost	5,862	4,779
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(14)
Fair Market Value	$ 5,861	$ 4,765

Investments - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Other-than-temporary impairment charges recognized	$ 0	$ 0	$ 0	$ 0
Realized gains (losses) from sale of available-for-sale securities	0	$ (24,000)	0	$ (24,000)
Acquired Indefinite-lived Intangible Assets [Line Items]
Acquisition-related contingent consideration, current	1,162,000		1,162,000		$ 1,849,000
ICAR \| Other current liabilities
Acquired Indefinite-lived Intangible Assets [Line Items]
Acquisition-related contingent consideration, current	$ 1,200,000		$ 1,200,000

Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Assets
Total assets at fair value	$ 5,861	$ 8,448
Liabilities
Acquisition-related contingent consideration	1,162	3,051
Total liabilities at fair value	1,162	3,051
U.S. Treasury
Assets
Short-term investments		3,683
Corporate debt securities \| Financial
Assets
Short-term investments	349	2,847
Corporate debt securities \| Industrial
Assets
Short-term investments	1,298	1,918
Commercial paper \| Financial
Assets
Short-term investments	2,922
Commercial paper \| Industrial
Assets
Short-term investments	1,292
Quoted Prices in Active Markets (Level 1)
Assets
Total assets at fair value	0	3,683
Liabilities
Acquisition-related contingent consideration	0	0
Total liabilities at fair value	0	0
Quoted Prices in Active Markets (Level 1) \| U.S. Treasury
Assets
Short-term investments		3,683
Quoted Prices in Active Markets (Level 1) \| Corporate debt securities \| Financial
Assets
Short-term investments	0	0
Quoted Prices in Active Markets (Level 1) \| Corporate debt securities \| Industrial
Assets
Short-term investments	0	0
Quoted Prices in Active Markets (Level 1) \| Commercial paper \| Financial
Assets
Short-term investments	0
Quoted Prices in Active Markets (Level 1) \| Commercial paper \| Industrial
Assets
Short-term investments	0
Significant Other Observable Inputs (Level 2)
Assets
Total assets at fair value	5,861	4,765
Liabilities
Acquisition-related contingent consideration	0	0
Total liabilities at fair value	0	0
Significant Other Observable Inputs (Level 2) \| U.S. Treasury
Assets
Short-term investments		0
Significant Other Observable Inputs (Level 2) \| Corporate debt securities \| Financial
Assets
Short-term investments	349	2,847
Significant Other Observable Inputs (Level 2) \| Corporate debt securities \| Industrial
Assets
Short-term investments	1,298	1,918
Significant Other Observable Inputs (Level 2) \| Commercial paper \| Financial
Assets
Short-term investments	2,922
Significant Other Observable Inputs (Level 2) \| Commercial paper \| Industrial
Assets
Short-term investments	1,292
Significant Unobservable Inputs (Level 3)
Assets
Total assets at fair value	0	0
Liabilities
Acquisition-related contingent consideration	1,162	3,051
Total liabilities at fair value	1,162	3,051
Significant Unobservable Inputs (Level 3) \| U.S. Treasury
Assets
Short-term investments		0
Significant Unobservable Inputs (Level 3) \| Corporate debt securities \| Financial
Assets
Short-term investments	0	0
Significant Unobservable Inputs (Level 3) \| Corporate debt securities \| Industrial
Assets
Short-term investments	0	$ 0
Significant Unobservable Inputs (Level 3) \| Commercial paper \| Financial
Assets
Short-term investments	0
Significant Unobservable Inputs (Level 3) \| Commercial paper \| Industrial
Assets
Short-term investments	$ 0

Investments - Summary of Contingent Consideration Measured at Fair Value (Details) - Contingent Consideration $ in Thousands	6 Months Ended
	Mar. 31, 2019 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Payment of contingent consideration	$ (1,818)
ICAR
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
September 30, 2018	3,051
Foreign currency effect on contingent consideration	(71)
Balance at March 31, 2019	$ 1,162

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 33,440		$ 33,440		$ 34,407
Amortization of intangible assets	$ 1,800	$ 600	$ 3,537	$ 1,119
Minimum
Goodwill and Intangible Assets [Line Items]
Estimated useful lives of intangible assets (in years)			2 years
Maximum
Goodwill and Intangible Assets [Line Items]
Estimated useful lives of intangible assets (in years)			7 years

Goodwill and Intangible Assets - Changes in Goodwill (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2019 USD ($)
Goodwill [Roll Forward]
September 30, 2018	$ 34,407
Foreign currency effect on goodwill	(1,088)
March 31, 2019	33,440
A2iA
Goodwill [Roll Forward]
September 30, 2018	24,991
A2iA purchase accounting adjustment	$ 121

Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 31, 2018	Mar. 31, 2019	Sep. 30, 2018
Indefinite Lived Intangible Assets By Major Class [Line Items]
Cost		$ 38,587	$ 38,587
Accumulated Amortization		10,119	5,640
Net		$ 28,468	32,947
Completed technologies
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	6 years 4 months 24 days	6 years 4 months 24 days
Cost		$ 20,341	20,341
Accumulated Amortization		5,202	3,070
Net		$ 15,139	17,271
Customer relationships
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	4 years 9 months 18 days	4 years 9 months 18 days
Cost		$ 17,628	17,628
Accumulated Amortization		4,615	2,351
Net		$ 13,013	15,277
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	4 years 6 months	4 years 6 months
Cost		$ 618	618
Accumulated Amortization		302	219
Net		$ 316	$ 399

Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
2019 (remaining six months)	$ 3,502
2020	6,400
2021	6,134
2022	5,739
2023	3,766
2024	1,779
Thereafter	1,148
Net	$ 28,468	$ 32,947

Stockholders' Equity - Stock-Based Compensation Expense Related to Stock Options and RSUs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense included in expenses	$ 2,353	$ 2,058	$ 5,023	$ 3,947
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense included in expenses	56	22	100	40
Selling and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense included in expenses	746	729	1,537	1,370
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense included in expenses	567	449	1,001	816
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense included in expenses	$ 984	$ 858	$ 2,385	$ 1,721

Stockholders' Equity - Fair Value Calculations for Stock-Based Compensation Awards (Details)	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		2.04%
Expected life (years)	5 years 5 months 15 days	5 years 1 month 24 days
Expected volatility	57.00%	60.00%
Expected dividends	0.00%	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.88%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	3.08%

Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended		9 Months Ended
	Nov. 06, 2018 $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($)	Dec. 31, 2016 shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($)	Sep. 30, 2015 shares	Feb. 28, 2019	Oct. 23, 2018 $ / right $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Mar. 07, 2018 shares	Mar. 10, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		$ 21,700			$ 21,700
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					2 years 8 months 12 days
Purchase of common stock (in shares)		2,390,119			2,390,119					2,806,364
Recognized compensation expense \| $		$ 2,353	$ 2,058		$ 5,023	$ 3,947
Total intrinsic value of options exercised \| $					$ 4,800	500
Weighted average fair value of options granted (in dollars per share) \| $ / shares					$ 9.50
Aggregate intrinsic value of options outstanding \| $		$ 15,600			$ 15,600					$ 8,700
Preferred stock, par value (in dollars per share) \| $ / shares		$ 0.001			$ 0.001				$ 0.001	$ 0.001
Percentage of common stock outstanding for acquiring person under right agreement								4.90%
Earnout shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense \| $					$ 0	400
Earnout shares \| IDchecker
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business combination, paid earnout shares issued (in shares)				81,182			137,306
Common stock trading period (in days)					10 days
Series B Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of preferred share purchase right for each share of common stock (in shares)									1
Preferred stock, share conversion ratio									0.001
Preferred stock, purchase price per right (in dollars per right) \| $ / right									35.00
Preferred stock, redemption price per share (in dollars per share) \| $ / shares									$ 0.0001
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					2 years 8 months 12 days
RSUs outstanding (in shares)		2,681,801			2,681,801					2,580,176
Recognized compensation expense \| $		$ 1,600	1,400		$ 3,700	2,600
Unrecognized compensation expense related to nonvested awards \| $		16,400			$ 16,400
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					3 years 3 months 18 days
Recognized compensation expense \| $		200	300		$ 400	600
Unrecognized compensation expense related to outstanding stock options \| $		2,100			2,100
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		1,100			$ 1,100
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					1 year 4 months 24 days
Performance Options \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		2,100			$ 2,100
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					2 years 7 months 6 days
Number of common stock reserved for future grants (in shares)	800,000
Recognized compensation expense \| $		$ 200			$ 300
Exercise price per share (in dollars per share) \| $ / shares	$ 9.50
Vesting period of awards	3 years
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)												9,500,000
Purchase of common stock (in shares)		1,676,413			1,676,413
Number of common stock reserved for future grants (in shares)		676,415			676,415
2012 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding (in shares)		2,220,193			2,220,193
2012 Plan \| Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding (in shares)		1,728,569			1,728,569
Recognized compensation expense \| $		$ 300	$ 400		$ 500	$ 700
Prior Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)		541,527			541,527
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)		871,658			871,658						1,000,000
Shares outstanding under ESPP (in shares)		128,342			128,342
Recognized compensation expense \| $		$ 100			$ 200
Director Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)												1,500,000
Number of common stock reserved for future grants (in shares)		391,701			391,701
Director Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)		366,870			366,870
Minimum \| ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount rate from market price, offering date					15.00%
Discount rate from market price, purchase date					0.15

Stockholders' Equity - Stock Option Activity (Details) - $ / shares	3 Months Ended	6 Months Ended
	Dec. 31, 2018	Mar. 31, 2019
Number of Shares
Outstanding, Beginning Balance (in shares)	2,806,364	2,806,364
Granted (in shares)		364,368
Exercised (in shares)		(637,051)
Canceled (in shares)		(143,562)
Outstanding, Ending Balance (in shares)		2,390,119
Weighted-Average Exercise Price
Outstanding, Beginning Balance (in dollars per share)	$ 4.75	$ 4.75
Granted (in dollars per share)		9.50
Exercised (in dollars per share)		3.38
Canceled (in dollars per share)		6.62
Outstanding, Ending Balance (in dollars per share)		$ 5.73
Weighted-Average Remaining Contractual Term (in Years)
Outstanding (in years)	4 years 7 months 6 days	5 years 3 months 18 days

Stockholders' Equity - RSU Activity (Details) - RSUs	6 Months Ended
Stockholders' Equity - RSU Activity (Details) - RSUs	Mar. 31, 2019 $ / shares shares
Number of Shares
Outstanding, Beginning Balance (in shares) \| shares	2,580,176
Granted (in shares) \| shares	1,069,254
Settled (in shares) \| shares	(682,214)
Canceled (in shares) \| shares	(285,415)
Outstanding, Ending Balance (in shares) \| shares	2,681,801
Weighted-Average Fair Market Value Per Share
Outstanding, Beginning Balance (in dollars per share) \| $ / shares	$ 6.92
Granted (in dollars per share) \| $ / shares	9.63
Settled (in dollars per share) \| $ / shares	6.00
Canceled (in dollars per share) \| $ / shares	6.97
Outstanding, Ending Balance (in dollars per share) \| $ / shares	$ 8.25

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income tax benefit	$ 794	$ (99)	$ 2,149	$ (3,713)
Effective tax rate			35.00%
Blended tax rate			22.50%

Commitments and Contingencies (Details) € in Thousands, £ in Thousands, ft² in Thousands	Jun. 11, 2018 EUR (€)	Jun. 11, 2018 USD ($)	May 03, 2018 USD ($)	Mar. 31, 2019 EUR (€) ft²	Mar. 31, 2019 GBP (£) ft²	Mar. 31, 2019 USD ($) ft²
Loss Contingencies [Line Items]
Annual base rent						$ 1,000,000.0
Tenant improvement allowances						1,000,000.0
Unamortized lease incentives						700,000
Line of Credit \| Revolving Credit Facility
Loss Contingencies [Line Items]
Maximum borrowing capacity			$ 10,000,000.0
Interest rate floor			4.50%
Minimum unrestricted cash and unused borrowing capacity			$ 15,000,000.0
Adjusted quick ratio requirement			1.75
Borrowings outstanding						0
Line of Credit \| Revolving Credit Facility \| Prime Rate
Loss Contingencies [Line Items]
Basis spread on variable rate			0.25%
Other current liabilities
Loss Contingencies [Line Items]
Unamortized lease incentives						100,000
Other non-current liabilities
Loss Contingencies [Line Items]
Unamortized lease incentives						600,000
United Kingdom
Loss Contingencies [Line Items]
Annual base rent					£ 63	$ 82,000
Building
Loss Contingencies [Line Items]
Office space subject to the lease (in square feet) \| ft²				29	29	29
A2iA \| France
Loss Contingencies [Line Items]
Annual base rent				€ 400		$ 400,000
A2iA \| United States
Loss Contingencies [Line Items]
Annual base rent						300,000
IDchecker \| Netherlands
Loss Contingencies [Line Items]
Annual base rent				200		200,000
ICAR \| Spain
Loss Contingencies [Line Items]
Annual base rent				€ 100		$ 100,000
Pending Litigation \| Global Equity & Corporate Consulting, S.L. \| ICAR
Loss Contingencies [Line Items]
Loss contingency, amount claimed	€ 800	$ 900,000

Revenue and Vendor Concentrations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 11,862		$ 11,862		$ 16,821
Customer Concentration Risk \| Sales Revenue Net
Revenue, Major Customer [Line Items]
Revenue	6,200	$ 5,800
Customer Concentration Risk \| Accounts Receivable
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 4,700	$ 2,400	4,700	$ 2,400
Customer Concentration Risk \| Customer One \| Sales Revenue Net
Revenue, Major Customer [Line Items]
Revenue			$ 6,900	$ 5,900
Total revenue, percentage	17.00%	24.00%	18.00%	22.00%
Customer Concentration Risk \| Customer Two \| Sales Revenue Net
Revenue, Major Customer [Line Items]
Total revenue, percentage			14.00%	17.00%
Geographic Concentration Risk \| Sales Revenue Net
Revenue, Major Customer [Line Items]
Total revenue, percentage	35.00%	23.00%	35.00%	26.00%

Label	Element	Value
Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 8,255,000
Accounting Standards Update 2016-09 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	8,255,000
Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	920,000
Accounting Standards Update 2014-09 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 920,000