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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) patent institution $ / shares | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) patent segment institution $ / shares | Jun. 30, 2017 USD ($) | Oct. 01, 2017 USD ($) | Sep. 30, 2017 USD ($) $ / shares
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 |  | 50 |  |  |
Number of patents granted | patent | 47 |  | 47 |  |  |
Number of pending patent applications | patent | 20 |  | 20 |  |  |
Foreign currency translation adjustment | $ (942,000) | $ 318,000 | $ (350,000) | $ 22,000 |  |
Other-than-temporary impairment charges recognized | 0 | $ 0 | 0 | $ 0 |  |
Allowance for doubtful accounts receivable | 234,000 |  | 234,000 |  |  | $ 31,000
Software development costs capitalized | $ 0 |  | 0 |  |  | $ 0
Capitalized software development costs for internal use software during period |  |  | $ 600,000 |  |  |
Number of operating segments | segment |  |  | 1 |  |  |
Number of reporting units | segment |  |  | 1 |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  | $ 0.001 |  |  | $ 0.001
Accumulated other comprehensive loss | $ 231,000 |  | $ 231,000 |  |  | $ (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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