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INCOME TAX - Change in Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement in Deferred Tax Valuation Allowance [Roll Forward]      
Valuation allowance, beginning of period $ (72,042) $ (23,390) $ (16,550)
Valuation allowance, end of period (132,531) (72,042) (23,390)
Net operating loss carryforwards | Foreign Tax Authority      
Movement in Deferred Tax Valuation Allowance [Roll Forward]      
Valuation allowance, change (63,113) (26,439) (7,979)
Net operating loss carryforwards | Domestic Tax Authority      
Movement in Deferred Tax Valuation Allowance [Roll Forward]      
Valuation allowance, change 2,178 (307) 1,145
Income tax credit carryforward | Foreign Tax Authority      
Movement in Deferred Tax Valuation Allowance [Roll Forward]      
Valuation allowance, change (2,486) (15,226)  
Income tax credit carryforward | State Tax Authority      
Movement in Deferred Tax Valuation Allowance [Roll Forward]      
Valuation allowance, change $ 2,932 $ (6,680) $ (6)