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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands | Mar. 31, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
--- | --- | ---
Funds Held for Clients |  |
Funds Held For Clients, Restricted Cash, Amortized Cost | $ 4,789 | $ 8,115
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost | 77,013 | 77,011
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains | 0 | 0
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains | 318 | 170
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses | (1) | (10)
Gross Unrealized Losses | (450) |
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses | (451) | (748)
Funds Held For Clients, Restricted Cash | 4,788 | 8,105
Funds Held For Clients, Restricted Cash and Debt Securities | $ 76,880 | $ 76,433
Number of securities in unrealized gain position | security | 79 | 45
Number of securities in unrealized loss position | security | 61 | 89
A and Above Investment Portfolio Concentration | 0.67 |
Individually |  |
Funds Held for Clients |  |
Gross Unrealized Losses | $ (29) | $ (38)
Aggregate |  |
Funds Held for Clients |  |
Gross Unrealized Losses |  | (738)
Corporate debt securities |  |
Funds Held for Clients |  |
Amortized Cost | 66,579 | 63,253
Gross Unrealized Gains | 305 | 164
Gross Unrealized Losses | (364) | (619)
Aggregate Estimated Fair Value | 66,520 | 62,798
Municipal bonds |  |
Funds Held for Clients |  |
Amortized Cost | 3,191 | 3,194
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (76) | (104)
Aggregate Estimated Fair Value | 3,115 | 3,090
U.S. Government agency securities |  |
Funds Held for Clients |  |
Amortized Cost | 2,454 | 2,449
Gross Unrealized Gains | 13 | 6
Gross Unrealized Losses | (10) | (15)
Aggregate Estimated Fair Value | 2,457 | 2,440
Available-for-sale securities |  |
Funds Held for Clients |  |
Amortized Cost | 72,224 | 68,896
Gross Unrealized Gains | 318 | 170
Gross Unrealized Losses | (450) | (738)
Aggregate Estimated Fair Value | $ 72,092 | $ 68,328

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