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INCOME TAXES - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 30, 2018
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2018
Income Taxes [Line Items]              
Effective income tax rate (benefit) expense, percent   19.20% (222.10%) 19.10% 17.30%    
Income tax expense (benefit)   $ 9,651,000 $ (562,000) $ 21,714,000 $ 8,138,000    
Long-term asset   114,676,000   $ 114,676,000   $ 103,341,000  
Withholding and interest for licencing and royalty payments $ 13,200,000            
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       $ 20,700,000   20,700,000  
U.S.Federal Government [Member]              
Income Taxes [Line Items]              
Estimated settlement amounts due (refunds) from withholding taxes             $ 16,200,000
Korean Government [Member]              
Income Taxes [Line Items]              
Estimated settlement amounts due (refunds) from withholding taxes             $ (36,900,000)
Allocation of Withholding to Non-Korean Patents [Member]              
Income Taxes [Line Items]              
Long-term asset   46,600,000   46,600,000   40,100,000  
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   $ 39,200,000   $ 39,200,000   $ 32,700,000