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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands | Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Funds Held for Clients |  |
Amortized Cost | $ 23,767 | $ 25,315
Gross Unrealized Gains | 477 | 606
Gross Unrealized Losses | (11) | (2)
Aggregate Estimated Fair Value | $ 24,233 | $ 25,919
Number of securities in unrealized gain position | security | 63 | 69
Number of securities in unrealized loss position | security | 2 | 2
Certificates of deposit |  |
Funds Held for Clients |  |
Amortized Cost | $ 7,119 | $ 7,370
Gross Unrealized Gains | 165 | 204
Gross Unrealized Losses | 0 | 0
Aggregate Estimated Fair Value | 7,284 | 7,574
Corporate debt securities |  |
Funds Held for Clients |  |
Amortized Cost | 8,894 | 9,415
Gross Unrealized Gains | 213 | 297
Gross Unrealized Losses | (4) | (1)
Aggregate Estimated Fair Value | 9,103 | 9,711
Municipal bonds |  |
Funds Held for Clients |  |
Amortized Cost | 7,254 | 7,531
Gross Unrealized Gains | 99 | 103
Gross Unrealized Losses | 0 | (1)
Aggregate Estimated Fair Value | 7,353 | 7,633
US Government agency securities |  |
Funds Held for Clients |  |
Amortized Cost | 500 | 500
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (7) | 0
Aggregate Estimated Fair Value | 493 | 501
Asset-backed securities |  |
Funds Held for Clients |  |
Amortized Cost | 0 | 499
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 0 | 0
Aggregate Estimated Fair Value | 0 | 500
Individually |  |
Funds Held for Clients |  |
Gross Unrealized Losses | $ (7) | $ (1)

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