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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2024 USD ($) institution $ / shares | Sep. 30, 2024 USD ($) segment institution reportingUnit $ / shares | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2022 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 | 7,900 |  |  |
Cumulative earnings deficit | $ 2,800,000 | $ 2,800,000 | $ 15,100,000 |  |
Foreign currency translation adjustment |  | 11,634,000 | 13,093,000 | $ (27,559,000) |
Foreign currency transaction adjustment |  | 1,000,000 | (700,000) | (800,000) |
Unbilled receivables | 400,000 | 400,000 | 900,000 |  |
Restructuring costs |  | 1,762,000 | 2,114,000 | 1,800,000 |
Write-offs of allowance for doubtful accounts |  | 200,000 | 100,000 | 0 |
Allowance for doubtful accounts receivable | 2,100,000 | 2,100,000 | 1,500,000 | 900,000 |
Additions to the allowance for credit loss |  | 700,000 | 700,000 | 500,000 |
Depreciation and amortization of property and equipment |  | 1,755,000 | 1,727,000 | 1,401,000 |
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 | 700,000 | 700,000 | 700,000 | 800,000 |
Amortization expense for capitalized software development costs for internal use |  | $ 900,000 | 700,000 | 400,000 |
Number of reporting units | reportingUnit |  | 1 |  |  |
Goodwill impairment | $ 0 | $ 0 |  |  |
Impairment to intangible assets |  | $ 0 | $ 0 | 0 |
Number of operating segments | segment |  | 1 |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 | $ 0.001 |  |
Trading-day average stock price period |  | 20 days |  |  |
Advertising costs |  | $ 1,400,000 | $ 1,200,000 | 1,100,000 |
Revenue |  | 172,083,000 | 172,552,000 | 144,804,000 |
Operating expenses |  | (169,852,000) | (156,988,000) | (132,604,000) |
Operating income |  | 2,231,000 | 15,564,000 | $ 12,200,000 |
Total Adjustments |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue |  | 1,400,000 |  |  |
Operating expenses |  | 500,000 |  |  |
Operating income |  | $ 1,900,000 |  |  |
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% | 0.00% |  |  | 0.00%
Total amounts outstanding under loan agreements | $ 2,700,000 | $ 2,700,000 | 1,200,000 |  |
Spanish Government Agencies | Other Current Liabilities | ICAR Vision Systems, S.L. |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Current loans payable | 300,000 | 300,000 | 200,000 |  |
Spanish Government Agencies | Other Noncurrent Liabilities | ICAR Vision Systems, S.L. |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Noncurrent loans payable | $ 2,400,000 | $ 2,400,000 | $ 1,100,000 |  |
Minimum |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment, estimated useful lives | 3 years | 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 |  |  | 5 years
Maximum |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment, estimated useful lives | 7 years | 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 |  |  | 12 years

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