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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands | Mar. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Funds Held for Clients |  |
Funds Held For Clients, Restricted Cash, Amortized Cost | $ 6,297 | $ 2,829
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost | 70,084 | 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 | 65 | 5
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses | (11) | 0
Gross Unrealized Losses | (2,071) |
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses | (2,071) | (2,480)
Funds Held For Clients, Restricted Cash | 6,286 | 2,829
Funds Held For Clients, Restricted Cash and Debt Securities | $ 68,078 | $ 59,385
Number of securities in unrealized gain position | security | 23 | 3
Number of securities in unrealized loss position | security | 114 | 124
IndividuallyMember |  |
Funds Held for Clients |  |
Gross Unrealized Losses | $ (81) | $ (96)
AggregateMember |  |
Funds Held for Clients |  |
Gross Unrealized Losses |  | (2,480)
Certificates of deposit |  |
Funds Held for Clients |  |
Amortized Cost | 980 | 983
Gross Unrealized Gains | 3 | 4
Gross Unrealized Losses | (2) | (2)
Aggregate Estimated Fair Value | 981 | 985
Corporate debt securities |  |
Funds Held for Clients |  |
Amortized Cost | 57,523 | 52,251
Gross Unrealized Gains | 62 | 1
Gross Unrealized Losses | (1,685) | (2,023)
Aggregate Estimated Fair Value | 55,900 | 50,229
Municipal bonds |  |
Funds Held for Clients |  |
Amortized Cost | 4,784 | 5,297
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (330) | (405)
Aggregate Estimated Fair Value | 4,454 | 4,892
U.S. Government agency securities |  |
Funds Held for Clients |  |
Amortized Cost | 500 | 500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (43) | (50)
Aggregate Estimated Fair Value | 457 | 450
Available-for-sale securities |  |
Funds Held for Clients |  |
Amortized Cost | 63,787 | 59,031
Gross Unrealized Gains | 65 | 5
Gross Unrealized Losses | (2,060) | (2,480)
Aggregate Estimated Fair Value | $ 61,792 | $ 56,556

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