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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) segment institution patent $ / shares | Dec. 31, 2017 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 | 6,100 |  |
Number of patents granted | patent | 49 |  |
Number of pending patent applications | patent | 21 |  |
Net (loss) gain resulting from exchange translation | $ (824,000) | $ 189,000 |
Other-than-temporary impairment charges recognized | 0 | 0 |
Write-offs of allowance for doubtful accounts | 0 | 0 |
Allowance for doubtful accounts receivable | 400,000 |  | $ 300,000
Capitalized software development costs | 0 | 0 |
Amortization expense of capitalized software development costs | 0 | 0 |
Capitalized software development costs for internal use | 49,000 | 54,000 |
Amortization expense from capitalized software development costs | $ 81,000 | $ 0 |
Number of operating segments | segment | 1 |  |
Number of reporting units | segment | 1 |  |
Goodwill impairment | $ 0 |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  | $ 0.001
Trading-day average stock price period | 20 days |  |
Accumulated other comprehensive loss | $ 1,397,000 |  | $ 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 | $ 600,000 |  | 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 | 200,000 |  | 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 |  | $ 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% |  |

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