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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2023 USD ($) institution | Sep. 30, 2022 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Number of financial services organizations, leading marketplace and financial technology brands (more than) | institution |  | 7,900 |
Spanish Government Agencies | HooYu |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt interest rate (as a percent) | 0.00% |  |
Amount outstanding under loan agreement |  | $ 1.3 | $ 1.3
Spanish Government Agencies | HooYu | Other current liabilities |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Current loans payable |  | 0.1 | 0.1
Spanish Government Agencies | HooYu | Other non-current liabilities |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Noncurrent loans payable |  | $ 1.2 | $ 1.2
Spanish Government Agencies | Minimum | HooYu |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Term of loan agreement (in years) | 5 years |  |
Spanish Government Agencies | Maximum | HooYu |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Term of loan agreement (in years) | 12 years |  |

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