INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Funds held for clients
Funds Held For Clients, Restricted Cash, Amortized Cost	$ 4,262	$ 3,447
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains	1	0
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses	(8)	(16)
Funds Held For Clients, Restricted Cash	4,255	3,431
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(576)
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost	76,379	76,320
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains	560	260
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses	(575)	(1,379)
Funds Held For Clients, Restricted Cash and Debt Securities	76,364	75,201
Available-for-sale securities
Funds held for clients
Amortized Cost	72,117	72,873
Gross Unrealized Gains	559	260
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(567)	(1,363)
Aggregate Estimated Fair Value	72,109	71,770
Certificates of deposit
Funds held for clients
Amortized Cost	738	845
Gross Unrealized Gains	1	2
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	0	(1)
Aggregate Estimated Fair Value	739	846
Corporate debt securities
Funds held for clients
Amortized Cost	65,241	67,277
Gross Unrealized Gains	528	258
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(430)	(1,090)
Aggregate Estimated Fair Value	65,339	66,445
Municipal bonds
Funds held for clients
Amortized Cost	3,716	4,251
Gross Unrealized Gains	0	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(119)	(239)
Aggregate Estimated Fair Value	3,597	4,012
U.S. Government agency securities
Funds held for clients
Amortized Cost	2,422	500
Gross Unrealized Gains	30	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(18)	(33)
Aggregate Estimated Fair Value	2,434	467
Recurring
Funds held for clients
Total	76,364	75,201
Recurring \| Money market funds
Funds held for clients
Funds held for clients	4,255	3,431
Recurring \| Available-for-sale securities
Funds held for clients
Funds held for clients	72,109	71,770
Recurring \| Level 1
Funds held for clients
Total	4,255	3,431
Recurring \| Level 1 \| Money market funds
Funds held for clients
Funds held for clients	4,255	3,431
Recurring \| Level 1 \| Available-for-sale securities
Funds held for clients
Funds held for clients	0	0
Recurring \| Level 2
Funds held for clients
Total	72,109	71,770
Recurring \| Level 2 \| Money market funds
Funds held for clients
Funds held for clients	0	0
Recurring \| Level 2 \| Available-for-sale securities
Funds held for clients
Funds held for clients	72,109	71,770
Recurring \| Level 3
Funds held for clients
Total	0	0
Recurring \| Level 3 \| Money market funds
Funds held for clients
Funds held for clients	0	0
Recurring \| Level 3 \| Available-for-sale securities
Funds held for clients
Funds held for clients	$ 0	$ 0

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Fair value portion of asset recognized for present right to economic benefit.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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