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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Funds Held for Clients
Funds Held For Clients, Restricted Cash, Amortized Cost	$ 2,320	$ 3,447
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost	76,408	76,320
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains	1	0
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains	134	260
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses	(4)	(16)
Gross Unrealized Losses	(1,489)
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses	(1,493)	(1,379)
Funds Held For Clients, Restricted Cash	2,316	3,431
Funds Held For Clients, Restricted Cash and Debt Securities	$ 75,048	$ 75,201
Number of securities in unrealized gain position | security	32	54
Number of securities in unrealized loss position | security	141	113
Individually
Funds Held for Clients
Gross Unrealized Losses	$ (60)	$ (61)
Aggregate
Funds Held for Clients
Gross Unrealized Losses		(1,363)
Certificates of deposit
Funds Held for Clients
Amortized Cost	842	845
Gross Unrealized Gains	2	2
Gross Unrealized Losses	(1)	(1)
Aggregate Estimated Fair Value	843	846
Corporate debt securities
Funds Held for Clients
Amortized Cost	66,607	67,277
Gross Unrealized Gains	130	258
Gross Unrealized Losses	(1,232)	(1,090)
Aggregate Estimated Fair Value	65,505	66,445
Municipal bonds
Funds Held for Clients
Amortized Cost	4,241	4,251
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(222)	(239)
Aggregate Estimated Fair Value	4,019	4,012
U.S. Government agency securities
Funds Held for Clients
Amortized Cost	2,398	500
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(34)	(33)
Aggregate Estimated Fair Value	2,365	467
Available-for-sale securities
Funds Held for Clients
Amortized Cost	74,088	72,873
Gross Unrealized Gains	133	260
Gross Unrealized Losses	(1,489)	(1,363)
Aggregate Estimated Fair Value	$ 72,732	$ 71,770

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