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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Funds held for clients |  |
Total | $ 95,122 | $ 72,636
Liabilities: |  |
Contingent purchase consideration | 3,880 |
Total | 3,880 |
Quoted Prices in Active Market (Level 1) |  |
Funds held for clients |  |
Total | 69,203 | 48,500
Liabilities: |  |
Contingent purchase consideration | 0 |
Total | 0 |
Significant Other Observable Inputs (Level 2) |  |
Funds held for clients |  |
Total | 25,919 | 24,136
Liabilities: |  |
Contingent purchase consideration | 0 |
Total | 0 |
Significant Unobservable Inputs (Level 3) |  |
Funds held for clients |  |
Total | 0 | 0
Liabilities: |  |
Contingent purchase consideration | 3,880 |
Total | 3,880 |
Money market funds | Fair Value, Measurements, Recurring |  |
Cash and cash equivalents |  |
Money market funds | 5,204 |
Money market funds | Fair Value, Measurements, Recurring | Quoted Prices in Active Market (Level 1) |  |
Cash and cash equivalents |  |
Money market funds | 5,204 |
Money market funds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Cash and cash equivalents |  |
Money market funds | 0 |
Money market funds | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Cash and cash equivalents |  |
Money market funds | 0 |
Money market funds | Fair Value, Measurements, Recurring |  |
Funds held for clients |  |
Funds for clients | 63,999 | 48,500
Money market funds | Fair Value, Measurements, Recurring | Quoted Prices in Active Market (Level 1) |  |
Funds held for clients |  |
Funds for clients | 63,999 | 48,500
Money market funds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Funds held for clients |  |
Funds for clients | 0 | 0
Money market funds | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Funds held for clients |  |
Funds for clients | 0 | 0
Available-for-sale securities | Fair Value, Measurements, Recurring |  |
Funds held for clients |  |
Funds for clients | 25,919 | 24,136
Available-for-sale securities | Fair Value, Measurements, Recurring | Quoted Prices in Active Market (Level 1) |  |
Funds held for clients |  |
Funds for clients | 0 | 0
Available-for-sale securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Funds held for clients |  |
Funds for clients | 25,919 | 24,136
Available-for-sale securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Funds held for clients |  |
Funds for clients | $ 0 | $ 0

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