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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 30, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]              
Effective income tax rate (benefit) expense, percent   (18.50%) 15.30% 17.90% 15.80%    
Income tax expense (benefit)   $ 9,217 $ 6,669 $ 17,355 $ 21,054    
Long-term asset   103,067   $ 103,067   $ 86,090  
Withholding and interest for licencing and royalty payments $ 13,200            
Withholding and interest for licencing and royalty payments period 3 years            
State and foreign income tax returns subject to examination period minimum (in years)       3 years      
State and foreign income tax returns subject to examination period maximum (in years)       4 years      
Reduction of Korean Withholding Taxes [Member]              
Income Taxes [Line Items]              
Reduction of deferred tax asset for foreign tax credits and R&D       $ 20,700   20,700  
U.S.Federal Government [Member]              
Income Taxes [Line Items]              
Estimated settlement amounts due (refunds) from withholding taxes             $ 16,200
Korean Government [Member]              
Income Taxes [Line Items]              
Estimated settlement amounts due (refunds) from withholding taxes             $ (36,900)
Allocation of Withholding to Non-Korean Patents [Member]              
Income Taxes [Line Items]              
Long-term asset   36,700   36,700   26,900  
Allocation of Withholding to Non-Korean Patents [Member] | U.S.Federal Government [Member]              
Income Taxes [Line Items]              
Estimated settlement amounts due (refunds) from withholding taxes   35,500   35,500   $ 25,700  
ASU No. 2016-09 [Member]              
Income Taxes [Line Items]              
Income tax expense (benefit)   $ 308,000,000 $ 693,000,000 $ 1,900 $ 3,500