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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Funds Held for Clients |  |
Amortized Cost | $ 17,165 | $ 24,060
Gross Unrealized Gains | 305 | 603
Gross Unrealized Losses | (19) | (2)
Aggregate Estimated Fair Value | 17,451 | 24,661
Funds Held For Clients, Restricted Cash and Debt Securities | 18,451 | 25,919
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses | (19) | (2)
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains | 305 | 603
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost | $ 18,165 | $ 25,318
Number of securities in unrealized gain position | security | 42 | 69
Number of securities in unrealized loss position | security | 9 | 2
Funds Held For Clients, Restricted Cash, Amortized Cost | $ 1,000 | $ 1,258
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses | 0 | 0
Funds Held For Clients, Restricted Cash | 1,000 | 1,258
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains | 0 | 0
Individually |  |
Funds Held for Clients |  |
Gross Unrealized Losses | (6) | (2)
Certificates of deposit |  |
Funds Held for Clients |  |
Amortized Cost | 5,153 | 7,370
Gross Unrealized Gains | 93 | 204
Gross Unrealized Losses | (4) | 0
Aggregate Estimated Fair Value | 5,242 | 7,574
Corporate debt securities |  |
Funds Held for Clients |  |
Amortized Cost | 8,085 | 8,914
Gross Unrealized Gains | 160 | 295
Gross Unrealized Losses | (5) | (1)
Aggregate Estimated Fair Value | 8,240 | 9,208
Municipal bonds |  |
Funds Held for Clients |  |
Amortized Cost | 3,427 | 7,276
Gross Unrealized Gains | 52 | 103
Gross Unrealized Losses | (5) | (1)
Aggregate Estimated Fair Value | 3,474 | 7,378
U.S. Government agency securities |  |
Funds Held for Clients |  |
Amortized Cost | 500 | 500
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (5) | 0
Aggregate Estimated Fair Value | $ 495 | $ 501

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