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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Funds held for clients |  |
Total | $ 28,616 | $ 95,122
Liabilities: |  |
Contingent purchase consideration | 3,880 | 3,880
Total | 3,880 | 3,880
Money market funds |  |
Funds held for clients |  |
Funds held for clients | 1,082 | 63,999
Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | 24,233 | 25,919
Money market funds |  |
Cash equivalents |  |
Cash equivalents | 3,301 | 5,204
Quoted Prices in Active Market (Level 1) |  |
Funds held for clients |  |
Total | 4,383 | 69,203
Liabilities: |  |
Contingent purchase consideration | 0 | 0
Total | 0 | 0
Quoted Prices in Active Market (Level 1) | Money market funds |  |
Funds held for clients |  |
Funds held for clients | 1,082 | 63,999
Quoted Prices in Active Market (Level 1) | Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | 0 | 0
Quoted Prices in Active Market (Level 1) | Money market funds |  |
Cash equivalents |  |
Cash equivalents | 3,301 | 5,204
Significant Other Observable Inputs (Level 2) |  |
Funds held for clients |  |
Total | 24,233 | 25,919
Liabilities: |  |
Contingent purchase consideration | 0 | 0
Total | 0 | 0
Significant Other Observable Inputs (Level 2) | Money market funds |  |
Funds held for clients |  |
Funds held for clients | 0 | 0
Significant Other Observable Inputs (Level 2) | Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | 24,233 | 25,919
Significant Other Observable Inputs (Level 2) | Money market funds |  |
Cash equivalents |  |
Cash equivalents | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Funds held for clients |  |
Total | 0 | 0
Liabilities: |  |
Contingent purchase consideration | 3,880 | 3,880
Total | 3,880 | 3,880
Significant Unobservable Inputs (Level 3) | Money market funds |  |
Funds held for clients |  |
Funds held for clients | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | 0 | 0
Significant Unobservable Inputs (Level 3) | Money market funds |  |
Cash equivalents |  |
Cash equivalents | $ 0 | $ 0

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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