LEASES - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Fixed lease cost	$ 25,052	$ 18,763
Variable lease cost	2,848	3,194
Net lease cost	27,900	21,957
Short-term lease cost	3,500	2,700
Sublease income	500	1,200
Cost of revenue
Lessee, Lease, Description [Line Items]
Fixed lease cost	2,280	3,215
Variable lease cost	80	312
General and administrative expense
Lessee, Lease, Description [Line Items]
Fixed lease cost	22,772	15,548
Variable lease cost	$ 2,768	$ 2,882