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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |
Carrying value | $ 24,913 | $ 24,913 |
Fair Value, Measurements, Recurring | Money market funds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Funds for clients | 63,999 | 63,999 | $ 48,500
Contingent Consideration |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Change in fair value of contingent purchase consideration | (1,135) | (1,135) |
Funds Held For Clients |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Current available-for-sale debt securities | $ 25,919 | $ 25,919 | $ 24,136

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