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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, check_deposit in Billions | 3 Months Ended
--- | ---
Dec. 31, 2020 USD ($) institution patent segment check_deposit $ / shares | Sep. 30, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Number of financial institutions signed agreements to deploy mobile deposit (more than) | institution | 7,500 |  |
Number of check deposits processed (more than) | check_deposit | 4 |  |
Number of patents granted | patent | 69 |  |
Number of pending patent applications | patent | 17 |  |
Net gain resulting from foreign exchange translation | $ 2,760,000 |  | $ 1,253,000
Research and development | 6,165,000 |  | 5,292,000
Other than temporary impairments recognized on investments | 0 |  | 0
Write-offs of allowance for doubtful accounts | 1,000 |  | 0
Allowance for doubtful accounts receivable | 200,000 | $ 200,000 |
Capitalized software development costs | 0 |  | 0
Amortization expense of capitalized software development costs | 0 |  | 0
Capitalized software development costs for internal use | 200,000 |  | 23,000
Amortization expense from capitalized software development costs for internal use | $ 100,000 |  | 100,000
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 |
Impairment charges related to intangible assets | $ 0 |  | 0
Trading-day average stock price period | 20 days |  |
Accumulated other comprehensive income (loss) | $ 2,384,000 | $ (323,000) |
Revision of Prior Period, Reclassification, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Research and development |  |  | $ 700,000
ICAR | Spanish Government Agencies |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Interest rate on loan agreement | 0.00% |  |
Amount outstanding under loan agreement | $ 700,000 | 700,000 |
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 |
ICAR | Spanish Government Agencies | Other non-current liabilities |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Amount outstanding under loan agreement | $ 600,000 | $ 600,000 |
Minimum | ICAR | Spanish Government Agencies |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Term of loan agreement | 5 years |  |
Maximum | ICAR | Spanish Government Agencies |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Term of loan agreement | 12 years |  |

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