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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 12 Months Ended
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Sep. 30, 2023 USD ($) institution segment reportingUnit $ / shares | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Dec. 31, 2017
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 | 7,900 |  |  |
Foreign currency translation adjustment | $ 13,093,000 | $ (27,559,000) | $ (455,000) |
Unbilled receivables | 900,000 | 1,700,000 |  |
Restructuring costs | 2,114,000 | 1,800,000 | 0 |
Other-than-temporary impairment charges recognized in earnings | 0 | 0 | 0 |
Write-offs of allowance for doubtful accounts | 100,000 | 0 | 100,000 |
Allowance for doubtful accounts receivable | 1,500,000 | 900,000 |  |
Depreciation and amortization of property and equipment | 1,727,000 | 1,401,000 | 1,439,000 |
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 | 700,000 | 800,000 | 800,000 |
Amortization expense for capitalized software development costs for internal use | $ 700,000 | 400,000 | 300,000 |
Number of operating segments | segment | 1 |  |  |
Number of reporting units | reportingUnit | 1 |  |  |
Goodwill impairment | $ 0 |  |  |
Impairment to intangible assets | $ 0 | $ 0 | 0 |
Trading-day average stock price period | 20 days |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |  |
Advertising costs | $ 1,200,000 | $ 1,100,000 | $ 1,200,000 |
Spanish Government Agencies | ICAR Vision Systems, S.L. |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Interest rate on loan agreements |  |  |  | 0.00%
Total amounts outstanding under loan agreements | 1,200,000 | 1,300,000 |  |
Spanish Government Agencies | Other Current Liabilities | ICAR Vision Systems, S.L. |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Current amount outstanding under loan agreements | 200,000 | 100,000 |  |
Spanish Government Agencies | Other Noncurrent Liabilities | ICAR Vision Systems, S.L. |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Non-current amount outstanding under loan agreements | $ 1,100,000 | $ 1,200,000 |  |
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 Vision Systems, S.L. |  |  |  |
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 Vision Systems, S.L. |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Repayment period of loan agreements |  |  |  | 12 years

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