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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) patent segment institution | Dec. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($)
Accounting Policies [Abstract] |  |  |  |
Number of financial institutions signed agreements to deploy mobile deposit (more than) (in institutions) | institution | 6,100 |  |  |
Number of top retail banks that deployed mobile deposit | institution | 50 |  |  |
Number of patents granted | patent | 35 |  |  |
Number of pending patent applications | patent | 19 |  |  |
Foreign currency translation adjustment gains (losses) | $ 189,000 | $ (370,000) |  |
Other-than-temporary impairment charges recognized | 0 | 0 |  |
Write-off of allowance for doubtful accounts | 0 | 0 |  |
Allowance for doubtful accounts receivable | 134,000 |  | $ 31,000 |
Capitalized software development costs | 54,000 | 0 |  |
Software development costs capitalized | 0 |  | 0 |
Capitalized software development costs amortized | $ 0 | $ 0 |  |
Number of operating segments (in segments) | segment | 1 |  |  |
Number of reporting units (in segments) | segment | 1 |  |  |
Accumulated other comprehensive income | $ 277,000 |  | $ 147,000 |
Retained Earnings | Accounting Standards Update 2016-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase to retained earnings |  |  |  | $ 8,300,000

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