CUSTOMER FUNDS - Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details) - Customer funds $ in Thousands	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	$ 390,054
Less than 12 Months, Gross Unrealized Losses	(198)
Greater than 12 months, Fair Value	0
Greater than 12 months, Gross Unrealized Losses	0
Total, Fair Value	390,054
Total, Gross Unrealized Losses	(198)
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	29,994
Less than 12 Months, Gross Unrealized Losses	(7)
Greater than 12 months, Fair Value	0
Greater than 12 months, Gross Unrealized Losses	0
Total, Fair Value	29,994
Total, Gross Unrealized Losses	(7)
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	360,060
Less than 12 Months, Gross Unrealized Losses	(191)
Greater than 12 months, Fair Value	0
Greater than 12 months, Gross Unrealized Losses	0
Total, Fair Value	360,060
Total, Gross Unrealized Losses	$ (191)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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