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INCOME TAXES - Differences Between Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. federal income tax provision (benefit) at statutory rate	$ (61,805)	$ (2,842)	$ 216
Foreign income and losses taxed at different rates	8,608	5,529	2,113
State income taxes, net of federal benefits, and state tax credits	6,487	5,297	720
Change in valuation allowances	(4,474)	(10,074)	(7,727)
Effect of income tax rate changes on deferred items	618	(3,443)	1,544
Tax effects of intercompany transactions	0	0	607
Adjustments related to uncertain tax positions	(15,518)	(12,418)	18
Non-deductible stock-based compensation expense	3,803	6,355	3,239
Tax (windfalls)/shortfalls on stock-based compensation awards	3,876	2,042	(335)
Federal research and development credits, net of adjustments	6,043	3,447	(8,331)
Forgiveness of intercompany liabilities	(2,863)	67	(1,340)
Ordinary stock loss	0	0	(11,815)
Net operating loss expiration	19,962	12,537	0
Goodwill impairment	23,202	0	0
Non-deductible or non-taxable items	4,557	(5,736)	20,134
Provision (benefit) for income taxes	$ (7,504)	$ 761	$ (957)

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