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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Mar. 31, 2018 USD ($) institution	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) segment institution	Mar. 31, 2017 USD ($)	Dec. 31, 2017 patent institution	Oct. 01, 2017 USD ($)	Sep. 30, 2017 USD ($)
Accounting Policies [Abstract]
Number of financial institutions signed agreements to deploy mobile deposit (more than) (in institutions) | institution	6,100		6,100
Number of top retail banks that deployed mobile deposit | institution					50
Number of patents granted | patent					39
Number of pending patent applications | patent					16
Foreign currency translation adjustment	$ 403,000	$ 74,000	$ 592,000	$ (296,000)
Other-than-temporary impairment charges recognized	0	$ 0	0	0
Allowance for doubtful accounts receivable	140,000		140,000				$ 31,000
Software development costs capitalized	0		0				0
Capitalized software development costs for internal use software during period			$ 300,000	$ 0
Number of operating segments | segment			1
Number of reporting units | segment			1
Accumulated other comprehensive loss	$ (668,000)		$ (668,000)				$ (147,000)
Retained Earnings | ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption						$ 8,300,000

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Unamortized costs incurred for development of computer software, which is to be sold, leased or otherwise marketed, after establishing technological feasibility through to the general release of the software products. Excludes capitalized costs of developing software for internal use.

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