RESTRUCTURING CHARGES - Schedule of Accrued Restructuring and Severance Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accrued restructuring and severance costs rollforward
Balance at beginning of period	$ 8,744	$ 3,763
Restructuring charges	1,089	17,806
Adjustment to previous accrual estimate		(594)
Write off of fixed assets, leases and other adjustments		(1,888)
Cash paid	(9,005)	(10,343)
Balance at end of period	828	8,744
Employee compensation costs
Accrued restructuring and severance costs rollforward
Balance at beginning of period	8,744	3,763
Restructuring charges	876	15,705
Adjustment to previous accrual estimate		(594)
Write off of fixed assets, leases and other adjustments		0
Cash paid	(8,792)	(10,130)
Balance at end of period	828	8,744
Other exit costs
Accrued restructuring and severance costs rollforward
Balance at beginning of period	0	0
Restructuring charges	213	2,101
Adjustment to previous accrual estimate		0
Write off of fixed assets, leases and other adjustments		(1,888)
Cash paid	(213)	(213)
Balance at end of period	$ 0	$ 0