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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands | Mar. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Funds Held for Clients |  |
Amortized Cost | $ 36,048 | $ 32,162
Gross Unrealized Gains | 6 | 12
Gross Unrealized Losses | (1,171) | (114)
Aggregate Estimated Fair Value | 34,883 | 32,060
Funds Held For Clients, Restricted Cash and Debt Securities | 36,027 | 33,176
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses | (1,171) | (114)
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains | 6 | 12
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost | $ 37,192 | $ 33,278
Number of securities in unrealized gain position | security | 3 | 10
Number of securities in unrealized loss position | security | 69 | 57
Funds Held For Clients, Restricted Cash, Amortized Cost | $ 1,144 | $ 1,116
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses | 0 | 0
Funds Held For Clients, Restricted Cash | 1,144 | 1,116
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains | 0 | 0
IndividuallyMember |  |
Funds Held for Clients |  |
Gross Unrealized Losses | (55) | (11)
AggregateMember [Member] |  |
Funds Held for Clients |  |
Gross Unrealized Losses |  | (114)
Certificates of deposit |  |
Funds Held for Clients |  |
Amortized Cost | 1,237 | 1,240
Gross Unrealized Gains | 6 | 7
Gross Unrealized Losses | (3) | (4)
Aggregate Estimated Fair Value | 1,240 | 1,243
Corporate debt securities |  |
Funds Held for Clients |  |
Amortized Cost | 26,502 | 22,597
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | (843) | (76)
Aggregate Estimated Fair Value | 25,659 | 22,523
Municipal bonds |  |
Funds Held for Clients |  |
Amortized Cost | 7,809 | 7,825
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (292) | (24)
Aggregate Estimated Fair Value | 7,517 | 7,804
U.S. Government agency securities |  |
Funds Held for Clients |  |
Amortized Cost | 500 | 500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (33) | (10)
Aggregate Estimated Fair Value | $ 467 | $ 490

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