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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Funds Held for Clients    
Amortized Cost $ 72,873 $ 59,031
Gross Unrealized Gains 260 5
Gross Unrealized Losses (1,363) (2,480)
Aggregate Estimated Fair Value 71,770 56,556
Funds Held For Clients, Restricted Cash and Debt Securities 75,201 59,385
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses (1,379) (2,480)
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains 260 5
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost $ 76,320 $ 61,860
Number of securities in unrealized gain position | security 54 3
Number of securities in unrealized loss position | security 113 124
Funds Held For Clients, Restricted Cash, Amortized Cost $ 3,447 $ 2,829
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses (16) 0
Funds Held For Clients, Restricted Cash 3,431 2,829
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains 0 0
Individually    
Funds Held for Clients    
Gross Unrealized Losses (61) (96)
Certificates of deposit    
Funds Held for Clients    
Amortized Cost 845 983
Gross Unrealized Gains 2 4
Gross Unrealized Losses (1) (2)
Aggregate Estimated Fair Value 846 985
Corporate debt securities    
Funds Held for Clients    
Amortized Cost 67,277 52,251
Gross Unrealized Gains 258 1
Gross Unrealized Losses (1,090) (2,023)
Aggregate Estimated Fair Value 66,445 50,229
Municipal bonds    
Funds Held for Clients    
Amortized Cost 4,251 5,297
Gross Unrealized Gains 0 0
Gross Unrealized Losses (239) (405)
Aggregate Estimated Fair Value 4,012 4,892
U.S. Government agency securities    
Funds Held for Clients    
Amortized Cost 500 500
Gross Unrealized Gains 0 0
Gross Unrealized Losses (33) (50)
Aggregate Estimated Fair Value $ 467 $ 450