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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Asset Purchase Agreement |  |
Liabilities: |  |
Asset Acquisition, Consideration Transferred, Contingent Consideration | $ (1,975) |
Recurring |  |
Funds held for clients |  |
Total | 19,860 | $ 95,122
Liabilities: |  |
Contingent purchase consideration(1) | 4,943 | 3,880
Total | 4,943 | 3,880
Recurring | Money Market Funds [Member] |  |
Funds held for clients |  |
Funds held for clients | 2,409 | 63,999
Recurring | Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | 17,451 | 25,919
Recurring | Money Market Funds [Member] |  |
CashEquivalentsAbstract |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 5,204
Recurring | Level 1 |  |
Funds held for clients |  |
Total | 2,409 | 69,203
Liabilities: |  |
Contingent purchase consideration(1) | 0 | 0
Total | 0 | 0
Recurring | Level 1 | Money Market Funds [Member] |  |
Funds held for clients |  |
Funds held for clients | 2,409 | 63,999
Recurring | Level 1 | Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | 0 | 0
Recurring | Level 1 | Money Market Funds [Member] |  |
CashEquivalentsAbstract |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 5,204
Recurring | Level 2 |  |
Funds held for clients |  |
Total | 17,451 | 25,919
Liabilities: |  |
Contingent purchase consideration(1) | 0 | 0
Total | 0 | 0
Recurring | Level 2 | Money Market Funds [Member] |  |
Funds held for clients |  |
Funds held for clients | 0 | 0
Recurring | Level 2 | Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | 17,451 | 25,919
Recurring | Level 2 | Money Market Funds [Member] |  |
CashEquivalentsAbstract |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0
Recurring | Level 3 |  |
Funds held for clients |  |
Total | 0 | 0
Liabilities: |  |
Contingent purchase consideration(1) | 4,943 | 3,880
Total | 4,943 | 3,880
Recurring | Level 3 | Money Market Funds [Member] |  |
Funds held for clients |  |
Funds held for clients | 0 | 0
Recurring | Level 3 | Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | $ 0 | 0
Recurring | Level 3 | Money Market Funds [Member] |  |
CashEquivalentsAbstract |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | $ 0

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