INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax (benefit) provision at statutory federal rate									$ 25,076	$ 18,929	$ (2,148)
State taxes, net of federal benefit									(3,098)	(17,197)	17
Change in valuation allowance									0	(71,300)	8,198
Foreign tax rate and tax law differential									611	1,206	313
Tax credits									(5,835)	(1,803)	(378)
Stock-based compensation									(50,818)	(8,072)	(953)
Other permanent items									(253)	31	235
Other nondeductible/nontaxable items									1,525	2,765	(5,112)
Uncertain tax positions									1,530	504	107
GILTI									0	1,086	917
Section 162(m)									11,469	2,817	202
Warrant mark-to-mark adjustment									5,208	0	0
Income tax (benefit) provision	$ (1,639)	$ 5,483	$ (6,561)	$ (11,868)	$ (72,245)	$ 272	$ 591	$ 348	$ (14,585)	$ (71,034)	$ 1,398