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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, 2023 | Dec. 31, 2022
--- | --- | ---
Funds held for clients |  |
Total | $ 68,078 | $ 59,385
Liabilities: |  |
Contingent purchase consideration(1) | 2,886 | 2,955
Total | 2,886 | 2,955
Money market funds |  |
Funds held for clients |  |
Funds held for clients | 6,286 | 2,829
Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | 61,792 | 56,556
Level 1 |  |
Funds held for clients |  |
Total | 6,286 | 2,829
Liabilities: |  |
Contingent purchase consideration(1) | 0 | 0
Total | 0 | 0
Level 1 | Money market funds |  |
Funds held for clients |  |
Funds held for clients | 6,286 | 2,829
Level 1 | Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | 0 | 0
Level 2 |  |
Funds held for clients |  |
Total | 61,792 | 56,556
Liabilities: |  |
Contingent purchase consideration(1) | 0 | 0
Total | 0 | 0
Level 2 | Money market funds |  |
Funds held for clients |  |
Funds held for clients | 0 | 0
Level 2 | Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | 61,792 | 56,556
Level 3 |  |
Funds held for clients |  |
Total | 0 | 0
Liabilities: |  |
Contingent purchase consideration(1) | 2,886 | 2,955
Total | 2,886 | 2,955
Level 3 | Money market funds |  |
Funds held for clients |  |
Funds held for clients | 0 | 0
Level 3 | Available-for-sale securities |  |
Funds held for clients |  |
Funds held for clients | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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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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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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