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v3.20.2

Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, checkDeposits in Billions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2019 USD ($) | Jun. 30, 2020 USD ($) institution checkDeposits patent $ / shares | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) segment patent institution checkDeposits $ / shares | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) $ / shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Number of financial institutions signed agreements to deploy mobile deposit (more than) | institution |  | 7,500 |  |  | 7,500 |  |
Number of check deposits processed (more than) | checkDeposits |  | 4 |  |  | 4 |  |
Number of patents granted | patent |  | 64 |  |  | 64 |  |
Number of pending patent applications | patent |  | 19 |  |  | 19 |  |
Net gain (loss) resulting from foreign exchange translation |  | $ 1,135,000 |  | $ 814,000 | $ 1,324,000 | $ (1,213,000) |
Other than temporary impairments recognized on investments |  | 0 |  | 0 | 0 | 0 |
Write-offs of allowance for doubtful accounts |  |  |  |  | 100,000 | 100,000 |
Allowance for doubtful accounts receivable |  | 200,000 |  |  | 200,000 |  | $ 200,000
Capitalized software development costs |  | $ 0 |  | $ 0 | 0 | 0 |
Amortization expense of capitalized software development costs |  |  |  |  | 0 | 0 |
Capitalized software development costs for internal use |  |  |  |  | 100,000 | 200,000 |
Amortization expense from capitalized software development costs for internal use |  |  |  |  | $ 300,000 | 300,000 |
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 |  | $ 0.001
Impairment charges related to intangible assets |  |  |  |  | $ 0 | $ 0 |
Trading-day average stock price period |  |  |  |  | 20 days |  |
Accumulated other comprehensive loss |  | $ 2,581,000 |  |  | $ 2,581,000 |  | $ 4,061,000
Operating lease liabilities | $ 8,200,000 | 7,325,000 |  |  | 7,325,000 |  |
Operating ROU assets | $ 6,800,000 | $ 5,683,000 |  |  | $ 5,683,000 |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  | us-gaap:AccountingStandardsUpdate201409Member |
ICAR | Spanish Government Agencies |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Interest rate on loan agreement |  | 0.00% |  |  | 0.00% |  |
Amount outstanding under loan agreement |  | $ 700,000 |  |  | $ 700,000 |  | 600,000
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 |  | 200,000
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 |  | $ 400,000
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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