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INTANGIBLE ASSETS, NET - Estimated Aggregate Amortization Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amortization Expense, Fiscal Year Maturity [Abstract]      
2021 $ 12,833    
2022 7,324    
2023 6,153    
2024 5,525    
2025 4,935    
Thereafter 3,003    
Total 39,773    
Impairment (5,713) $ 0 $ (5,166)
Licensing Fee [Member]      
Amortization Expense, Fiscal Year Maturity [Abstract]      
2021 2,375    
2022 980    
2023 398    
2024 193    
2025 0    
Thereafter 0    
Total 3,946    
Impairment (471)    
IP Right [Member]      
Amortization Expense, Fiscal Year Maturity [Abstract]      
2021 4,964    
2022 1,139    
2023 1,139    
2024 1,139    
2025 761    
Thereafter 0    
Total 9,142    
Impairment (5,160) $ (5,054)
Trademarks [Member]      
Amortization Expense, Fiscal Year Maturity [Abstract]      
2021 1,068    
2022 1,068    
2023 1,068    
2024 1,068    
2025 1,068    
Thereafter 1,601    
Total 6,941    
Impairment 0    
Technology [Member]      
Amortization Expense, Fiscal Year Maturity [Abstract]      
2021 2,533    
2022 2,533    
2023 2,533    
2024 2,533    
2025 2,533    
Thereafter 213    
Total 12,878    
Impairment 0    
Others [Member]      
Amortization Expense, Fiscal Year Maturity [Abstract]      
2021 1,893    
2022 1,604    
2023 1,015    
2024 592    
2025 573    
Thereafter 1,189    
Total 6,866    
Impairment $ (82)