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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]      
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)
Non-deductible stock-based compensation expense 3,803 6,355 3,239
Accumulated deficit (1,320,886) (1,032,876)  
Operating loss carryforwards, domestic 24,100    
Operating loss carryforwards, state and local 77,500    
Operating loss carryforwards, foreign 465,200    
Unrecognized tax benefits that would impact effective tax rate 19,900 25,100 33,300
Income tax examination, penalties and interest expense 1,000 1,400 1,600
Income tax examination, penalties and interest accrued 4,900 4,900  
Income tax benefits recognized as a result of new estimates 8,900 $ 12,300 7,900
International      
Operating Loss Carryforwards [Line Items]      
Income tax examination, penalties and interest expense 126,400    
Decrease in unrecognized tax benefits is reasonably possible $ 3,400    
Revision of Prior Period, Adjustment      
Operating Loss Carryforwards [Line Items]      
State income taxes, net of federal benefits, and state tax credits     2,000
Change in valuation allowances     3,800
Non-deductible stock-based compensation expense     $ 7,300