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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