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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands | Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Funds Held for Clients |  |
Amortized Cost | $ 32,162 | $ 24,060
Gross Unrealized Gains | 12 | 603
Gross Unrealized Losses | (114) | (2)
Aggregate Estimated Fair Value | 32,060 | 24,661
Funds Held For Clients, Restricted Cash and Debt Securities | 33,176 | 25,919
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses | (114) | (2)
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains | 12 | 603
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost | $ 33,278 | $ 25,318
Number of securities in unrealized gain position | security | 10 | 69
Number of securities in unrealized loss position | security | 57 | 2
Funds Held For Clients, Restricted Cash, Amortized Cost | $ 1,116 | $ 1,258
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses | 0 | 0
Funds Held For Clients, Restricted Cash | 1,116 | 1,258
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains | 0 | 0
Individually |  |
Funds Held for Clients |  |
Gross Unrealized Losses | (11) | (2)
Certificates of deposit |  |
Funds Held for Clients |  |
Amortized Cost | 1,240 | 7,370
Gross Unrealized Gains | 7 | 204
Gross Unrealized Losses | (4) | 0
Aggregate Estimated Fair Value | 1,243 | 7,574
Corporate debt securities |  |
Funds Held for Clients |  |
Amortized Cost | 22,597 | 8,914
Gross Unrealized Gains | 2 | 295
Gross Unrealized Losses | (76) | (1)
Aggregate Estimated Fair Value | 22,523 | 9,208
Municipal bonds |  |
Funds Held for Clients |  |
Amortized Cost | 7,825 | 7,276
Gross Unrealized Gains | 3 | 103
Gross Unrealized Losses | (24) | (1)
Aggregate Estimated Fair Value | 7,804 | 7,378
U.S. Government agency securities |  |
Funds Held for Clients |  |
Amortized Cost | 500 | 500
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (10) | 0
Aggregate Estimated Fair Value | $ 490 | $ 501

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