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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) institution | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2022 USD ($) segment institution | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Feb. 05, 2021 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 | 7,800 |  |  |  |  | 7,800 |  |  |
Foreign currency translation adjustment |  | $ (13,595,000) | $ (1,862,000) | $ (3,129,000) | $ (16,724,000) | $ (27,559,000) | $ (455,000) | $ 3,635,000 |
Unbilled receivables | $ 1,900,000 |  |  |  |  | 1,900,000 | 0 |  |
Restructuring costs |  | $ 1,807,000 |  |  | 1,807,000 | 1,800,000 | 0 | (114,000) |
Other-than-temporary impairment charges recognized in earnings |  |  |  |  |  | 0 | 0 | 0 |
Write-offs of allowance for doubtful accounts |  |  |  |  |  | 0 | 100,000 | 200,000 |
Allowance for doubtful accounts receivable | 900,000 |  |  |  |  | 900,000 | 400,000 |  |
Depreciation and amortization of property and equipment |  |  |  | 555,000 | $ 1,064,000 | 1,401,000 | 1,439,000 | 1,504,000 |
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 | 0 |
Amortization expense for capitalized software development costs |  |  |  |  |  | 0 | 0 | 0 |
Capitalized software development costs for internal use | 800,000 |  |  |  |  | 800,000 | 800,000 | 300,000 |
Amortization expense for capitalized software development costs for internal use |  |  |  |  |  | $ 400,000 | 300,000 | 400,000 |
Number of operating segments | segment |  |  |  |  |  | 1 |  |  |
Number of reporting units | segment |  |  |  |  |  | 1 |  |  |
Goodwill impairment | 0 |  |  |  |  |  |  |  |
Impairment to intangible assets |  |  |  |  |  | $ 0 | 0 | 0 |
Trading-day average stock price period |  |  |  |  |  | 20 days |  |  |
Advertising costs |  |  |  |  |  | $ 1,100,000 | 1,200,000 | $ 1,600,000 |
Embedded conversion derivative | 0 |  |  |  |  | 0 | 48,208,000 |  |
Convertible Debt | Convertible Senior Unsecured Notes Due 2026 |  |  |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on loan agreements |  |  |  |  |  |  |  |  | 0.75%
Fair value of notes |  |  | 28,500,000 | 28,500,000 |  |  |  |  |
Convertible Debt | Convertible Senior Unsecured Notes Due 2026 | Embedded conversion derivative |  |  |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Embedded conversion derivative | $ 0 |  | $ 28,500,000 | $ 28,500,000 |  | $ 0 | 48,208,000 |  | $ 33,200,000
Spanish Government Agencies | ICAR |  |  |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on loan agreements | 0.00% |  |  |  |  | 0.00% |  |  |
Total amounts outstanding under loan agreements | $ 1,300,000 |  |  |  |  | $ 1,300,000 | 800,000 |  |
Spanish Government Agencies | ICAR | Other Current Liabilities |  |  |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Current amount outstanding under loan agreements | 100,000 |  |  |  |  | 100,000 | 100,000 |  |
Spanish Government Agencies | ICAR | Other Noncurrent Liabilities |  |  |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Non-current amount outstanding under loan agreements | $ 1,200,000 |  |  |  |  | $ 1,200,000 | $ 700,000 |  |
Minimum |  |  |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 3 years |  |  |
Minimum | Spanish Government Agencies | ICAR |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 7 years |  |  |
Maximum | Spanish Government Agencies | ICAR |  |  |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Repayment period of loan agreements |  |  |  |  |  | 12 years |  |  |

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