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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Liabilities: |  |  |  |  |
Asset Acquisition, Consideration Transferred, Contingent Consideration |  |  |  | $ 3,038 |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | $ (645) |  |  | (160) | $ 1,135
Payment for Contingent Consideration Liability, Financing Activities |  | $ (1,784) |  | (1,784) | 0
Asset Purchase Agreement |  |  |  |  |
Liabilities: |  |  |  |  |
Asset Acquisition, Consideration Transferred, Contingent Consideration |  |  | $ (1,975) |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  | $ 191 |  |  |
Payment for Contingent Consideration Liability, Financing Activities |  |  |  | (1,784) |
Third Asset Purchase Agreement |  |  |  |  |
Liabilities: |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | (160) |  | $ 465 |  |
Recurring |  |  |  |  |
Funds held for clients |  |  |  |  |
Total | 33,176 |  |  | 33,176 | 95,122
Liabilities: |  |  |  |  |
Contingent purchase consideration(1) | 4,329 |  |  | 4,329 | 3,880
Total | 4,329 |  |  | 4,329 | 3,880
Recurring | Money Market Funds [Member] |  |  |  |  |
Funds held for clients |  |  |  |  |
Funds held for clients | 1,116 |  |  | 1,116 | 63,999
Recurring | Available-for-sale securities |  |  |  |  |
Funds held for clients |  |  |  |  |
Funds held for clients | 32,060 |  |  | 32,060 | 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 | 1,116 |  |  | 1,116 | 69,203
Liabilities: |  |  |  |  |
Contingent purchase consideration(1) | 0 |  |  | 0 | 0
Total | 0 |  |  | 0 | 0
Recurring | Level 1 | Money Market Funds [Member] |  |  |  |  |
Funds held for clients |  |  |  |  |
Funds held for clients | 1,116 |  |  | 1,116 | 63,999
Recurring | Level 1 | Available-for-sale securities |  |  |  |  |
Funds held for clients |  |  |  |  |
Funds held for clients | 0 |  |  | 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 | 32,060 |  |  | 32,060 | 25,919
Liabilities: |  |  |  |  |
Contingent purchase consideration(1) | 0 |  |  | 0 | 0
Total | 0 |  |  | 0 | 0
Recurring | Level 2 | Money Market Funds [Member] |  |  |  |  |
Funds held for clients |  |  |  |  |
Funds held for clients | 0 |  |  | 0 | 0
Recurring | Level 2 | Available-for-sale securities |  |  |  |  |
Funds held for clients |  |  |  |  |
Funds held for clients | 32,060 |  |  | 32,060 | 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 | 0
Liabilities: |  |  |  |  |
Contingent purchase consideration(1) | 4,329 |  |  | 4,329 | 3,880
Total | 4,329 |  |  | 4,329 | 3,880
Recurring | Level 3 | Money Market Funds [Member] |  |  |  |  |
Funds held for clients |  |  |  |  |
Funds held for clients | 0 |  |  | 0 | 0
Recurring | Level 3 | Available-for-sale securities |  |  |  |  |
Funds held for clients |  |  |  |  |
Funds held for clients | $ 0 |  |  | $ 0 | 0
Recurring | Level 3 | Money Market Funds [Member] |  |  |  |  |
CashEquivalentsAbstract |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  |  |  |  | $ 0

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