INCOME TAXES - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
U.S. federal	$ (237)	$ 2	$ 2
State	(339)	(122)	37
Foreign	(5,391)	(1,542)	(1,914)
Total Current	(5,967)	(1,662)	(1,875)
Deferred
U.S. federal	8,355	465	3,803
State	325	17	146
Foreign	(3,027)	(11,278)	(23,360)
Total Deferred	5,653	(10,796)	(19,411)
Changes in valuation allowance	(6,695)	(482)	(3,950)
Total	$ (7,009)	$ (12,940)	$ (25,236)