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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands | Jun. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Funds Held for Clients |  |
Funds Held For Clients, Restricted Cash, Amortized Cost | $ 14 | $ 2,829
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost | 73,372 | 61,860
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains | 0 | 0
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains | 14 | 5
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses | 0 | 0
Gross Unrealized Losses | (2,512) |
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses | (2,512) | (2,480)
Funds Held For Clients, Restricted Cash | 14 | 2,829
Funds Held For Clients, Restricted Cash and Debt Securities | $ 70,874 | $ 59,385
Number of securities in unrealized gain position | security | 8 | 3
Number of securities in unrealized loss position | security | 160 | 124
Individually |  |
Funds Held for Clients |  |
Gross Unrealized Losses | $ (82) | $ (96)
Aggregate |  |
Funds Held for Clients |  |
Gross Unrealized Losses |  | (2,480)
Certificates of deposit |  |
Funds Held for Clients |  |
Amortized Cost | 976 | 983
Gross Unrealized Gains | 3 | 4
Gross Unrealized Losses | (2) | (2)
Aggregate Estimated Fair Value | 977 | 985
Corporate debt securities |  |
Funds Held for Clients |  |
Amortized Cost | 67,108 | 52,251
Gross Unrealized Gains | 11 | 1
Gross Unrealized Losses | (2,134) | (2,023)
Aggregate Estimated Fair Value | 64,985 | 50,229
Municipal bonds |  |
Funds Held for Clients |  |
Amortized Cost | 4,774 | 5,297
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (328) | (405)
Aggregate Estimated Fair Value | 4,446 | 4,892
U.S. Government agency securities |  |
Funds Held for Clients |  |
Amortized Cost | 500 | 500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (48) | (50)
Aggregate Estimated Fair Value | 452 | 450
Available-for-sale securities |  |
Funds Held for Clients |  |
Amortized Cost | 73,358 | 59,031
Gross Unrealized Gains | 14 | 5
Gross Unrealized Losses | (2,512) | (2,480)
Aggregate Estimated Fair Value | $ 70,860 | $ 56,556

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