INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands	Jun. 30, 2026 USD ($) security	Dec. 31, 2025 USD ($) security
Funds Held for Clients
Funds Held For Clients, Restricted Cash, Amortized Cost	$ 5,505	$ 1,787
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost	105,023	90,004
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains	1	0
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains	98	529
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses	(1)	(3)
Gross Unrealized Losses	(512)
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses	(513)	(97)
Funds Held For Clients, Restricted Cash	5,505	1,784
Funds Held For Clients, Restricted Cash and Debt Securities	$ 104,608	$ 90,436
Number of securities in unrealized gain position \| security	46	127
Number of securities in unrealized loss position \| security	131	27
Individually
Funds Held for Clients
Gross Unrealized Losses	$ (18)	$ (13)
Aggregate
Funds Held for Clients
Gross Unrealized Losses		(94)
Corporate debt securities
Funds Held for Clients
Amortized Cost	95,967	83,160
Gross Unrealized Gains	95	501
Gross Unrealized Losses	(494)	(77)
Aggregate Estimated Fair Value	95,568	83,584
Municipal bonds
Funds Held for Clients
Amortized Cost		1,542
Gross Unrealized Gains		0
Gross Unrealized Losses		(17)
Aggregate Estimated Fair Value		1,525
U.S. Government agency securities
Funds Held for Clients
Amortized Cost	3,551	3,515
Gross Unrealized Gains	2	28
Gross Unrealized Losses	(18)	0
Aggregate Estimated Fair Value	3,535	3,543
Available-for-sale securities
Funds Held for Clients
Amortized Cost	99,518	88,217
Gross Unrealized Gains	97	529
Gross Unrealized Losses	(512)	(94)
Aggregate Estimated Fair Value	$ 99,103	$ 88,652

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