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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, check_deposit in Billions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2019 USD ($) | Sep. 30, 2020 USD ($) patent institution check_deposit $ / shares | Sep. 30, 2020 USD ($) patent institution check_deposit segment $ / shares | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2018 USD ($)
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 |  | 7,500 | 7,500 |  |  |  |
Number of check deposits processed (over) | check_deposit |  | 4 | 4 |  |  |  |
Number of patents granted | patent |  | 67 | 67 |  |  |  |
Number of patent applications pending | patent |  | 20 | 20 |  |  |  |
Foreign currency translation gains (losses) |  |  | $ 3,635,000 | $ (3,504,000) |  | $ (723,000) |
Product management costs |  |  | 22,859,000 | 21,873,000 | [1] | 18,118,000 | [1]
Other-than-temporary impairment charges recognized in earnings |  |  | 0 | 0 |  | 0 |
Write-offs of allowance for doubtful accounts |  |  | 200,000 | 100,000 |  | 0 |
Allowance for doubtful accounts receivable |  | $ 200,000 | 200,000 | 200,000 |  |  |
Depreciation and amortization of property and equipment |  |  | 1,504,000 | 1,388,000 |  | 615,000 |
Repairs and maintenance expenses |  |  | 100,000 | 100,000 |  | 100,000 |
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 |  | 300,000 | 300,000 | 200,000 |  | 900,000 |
Amortization expense for capitalized software development costs for internal use |  |  | $ 400,000 | $ 300,000 |  | 100,000 |
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 |  |  |
Impairment to intangible assets |  |  | $ 0 | $ 0 |  | 0 |
Trading-day average stock price period |  |  | 20 days |  |  |  |
Advertising costs |  |  | $ 1,600,000 | 800,000 |  | $ 500,000 |
Accumulated other comprehensive loss |  | $ 323,000 | 323,000 | $ 4,061,000 |  |  |
Operating lease liabilities | $ 8,200,000 | 7,146,000 | 7,146,000 |  |  |  |
Operating ROU assets | $ 6,800,000 | $ 5,407,000 | 5,407,000 |  |  |  |
Accounting Standard Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  | us-gaap:AccountingStandardsUpdate201409Member |  | us-gaap:AccountingStandardsUpdate201609Member |
Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Product management costs |  |  | $ 3,000,000.0 | $ 2,900,000 |  | $ 2,400,000 |
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 |  | $ 700,000 | $ 700,000 | 600,000 |  |  |
ICAR | Spanish Government Agencies | Other Current Liabilities |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Current amount outstanding under loan agreements |  | 100,000 | 100,000 | 200,000 |  |  |
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 |  | $ 600,000 | $ 600,000 | $ 400,000 |  |  |
Minimum |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  | 3 years |  |  |  |
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 | ICAR | Spanish Government Agencies |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Repayment period of loan agreements |  |  | 12 years |  |  |  |
[1] | September 30, 2019 and 2018 consolidated statements of operations reflect reclassifications to conform to the current year presentation.

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