INCOME TAXES - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Current:
Federal	$ 37	$ 31	$ 56	$ 68
State and local	90	83	161	251
Foreign	(64)	252	(56)	322
Total current provision	63	366	161	641
Deferred:
Federal	(1,622)	(597)	(1,467)	(878)
State and local	0	0	0	0
Foreign	(81)	(3,519)	(165)	(3,611)
Total deferred benefit	(1,703)	(4,116)	(1,632)	(4,489)
Benefit from income taxes	$ (1,640)	$ (3,750)	$ (1,471)	$ (3,848)