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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Debt Securities, Available-for-sale (Details) $ in Thousands	Sep. 30, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Funds Held for Clients
Amortized Cost	$ 17,165	$ 24,060
Gross Unrealized Gains	305	603
Gross Unrealized Losses	(19)	(2)
Aggregate Estimated Fair Value	17,451	24,661
Funds Held For Clients, Restricted Cash and Debt Securities	18,451	25,919
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses	(19)	(2)
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Gains	305	603
Funds Held For Clients, Restricted Cash and Debt Securities, Amortized Cost	$ 18,165	$ 25,318
Number of securities in unrealized gain position | security	42	69
Number of securities in unrealized loss position | security	9	2
Funds Held For Clients, Restricted Cash, Amortized Cost	$ 1,000	$ 1,258
Funds Held For Clients, Restricted Cash, Gross Unrealized Losses	0	0
Funds Held For Clients, Restricted Cash	1,000	1,258
Funds Held For Clients, Restricted Cash, Gross Unrealized Gains	0	0
Individually
Funds Held for Clients
Gross Unrealized Losses	(6)	(2)
Certificates of deposit
Funds Held for Clients
Amortized Cost	5,153	7,370
Gross Unrealized Gains	93	204
Gross Unrealized Losses	(4)	0
Aggregate Estimated Fair Value	5,242	7,574
Corporate debt securities
Funds Held for Clients
Amortized Cost	8,085	8,914
Gross Unrealized Gains	160	295
Gross Unrealized Losses	(5)	(1)
Aggregate Estimated Fair Value	8,240	9,208
Municipal bonds
Funds Held for Clients
Amortized Cost	3,427	7,276
Gross Unrealized Gains	52	103
Gross Unrealized Losses	(5)	(1)
Aggregate Estimated Fair Value	3,474	7,378
U.S. Government agency securities
Funds Held for Clients
Amortized Cost	500	500
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(5)	0
Aggregate Estimated Fair Value	$ 495	$ 501

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