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PROPERTY, EQUIPMENT AND SOFTWARE, NET - Schedule of Impairment Charges for Long-lived Assets by Asset Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets	$ 870	$ 15,178
Leasehold improvements
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets	870	8,419
Computer hardware and purchased software
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets	0	2,842
Internally-developed software
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets	0	2,988
Other Property, equipment and software, net
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets	$ 0	$ 929