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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, deposit in Billions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) patent institution deposit $ / shares | Sep. 30, 2019 USD ($) deposit segment institution patent $ / shares | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2017 USD ($) | Oct. 01, 2019 USD ($) | Oct. 23, 2018 $ / shares
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of financial services organizations, leading marketplace and financial technology brands (more than) | institution | 6,500 | 6,500 |  |  |  |
Number of check deposits processed (over) | deposit | 3 | 3 |  |  |  |
Number of patents granted | patent | 57 | 57 |  |  |  |
Number of patent applications pending | patent | 25 | 25 |  |  |  |
Foreign currency translation adjustment |  | $ (3,504,000) | $ (723,000) | $ 208,000 |  |
Other-than-temporary impairment charges recognized in earnings |  | 0 | 0 | 0 |  |
Write-offs of allowance for doubtful accounts |  | 100,000 | 0 | 0 |  |
Allowance for doubtful accounts receivable | $ 200,000 | 200,000 | 300,000 |  |  |
Depreciation and amortization of property and equipment |  | 1,388,000 | 615,000 | 322,000 |  |
Repairs and maintenance expenses |  | 100,000 | 100,000 | 200,000 |  |
Impairment or long-lived assets |  | 0 | 0 | 0 |  |
Capitalized software development costs | 0 | 0 | 0 |  |  |
Amortization expense for capitalized software development costs |  | 0 | 0 | 0 |  |
Capitalized software development costs for internal use | 200,000 | 200,000 | 900,000 |  |  |
Amortization expense for capitalized software development costs for internal use |  | $ 300,000 | $ 100,000 | 0 |  |
Number of operating segments | segment |  | 1 |  |  |  |
Number of reporting units | segment |  | 1 |  |  |  |
Goodwill impairment | $ 0 |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 | $ 0.001 |  |  | $ 0.001
Impairment to intangible assets |  | $ 0 | $ 0 | 0 |  |
Trading-day average stock price period |  | 20 days |  |  |  |
Advertising costs |  | $ 800,000 | 500,000 | $ 300,000 |  |
Accumulated other comprehensive loss | $ (4,061,000) | $ (4,061,000) | (586,000) |  |  |
ICAR | Spanish Government Agencies |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Interest rate of loan agreements | 0.00% | 0.00% |  |  |  |
Total amounts outstanding under loan agreements | $ 600,000 | $ 600,000 | 800,000 |  |  |
ICAR | Spanish Government Agencies | Other Current Liabilities |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Current amount outstanding under loan agreements | 200,000 | 200,000 | 300,000 |  |  |
ICAR | Spanish Government Agencies | Other Noncurrent Liabilities |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Non-current amount outstanding under loan agreements | $ 400,000 | $ 400,000 | $ 500,000 |  |  |
Minimum |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, estimated useful lives |  | 3 years |  |  |  |
Minimum | ASU 2016-02 | Scenario, Forecast |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Lease liabilities |  |  |  |  | $ 7,900,000 |
Right-of-use assets |  |  |  |  | 6,500,000 |
Minimum | ICAR | Spanish Government Agencies |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Repayment period of loan agreements |  | 5 years |  |  |  |
Maximum |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, estimated useful lives |  | 10 years |  |  |  |
Maximum | ASU 2016-02 | Scenario, Forecast |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Lease liabilities |  |  |  |  | 8,400,000 |
Right-of-use assets |  |  |  |  | $ 7,000,000.0 |
Maximum | ICAR | Spanish Government Agencies |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Repayment period of loan agreements |  | 12 years |  |  |  |

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