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FAIR VALUE MEASUREMENTS - Summary of Level 3 Instruments Measured at Fair Value on Recurring Basis (Details) - Recurring [Member] - Level 3 [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liabilities [Abstract]      
Beginning Balance $ (29,481) $ (636,716) $ (726,950)
Fair value gain (loss) (87) (472,877) 41,259
Conversion into Class A ordinary shares 29,568 1,080,112 48,975
Ending Balance 0 (29,481) (636,716)
Available-for-Sale Investments, Current [Member]      
Level 3 Instruments Measured at Fair Value on a Recurring Basis [Abstract]      
Beginning balance 72,000 0  
Investment   72,000  
Conversion into ordinary shares of investee (72,000)    
Addition 20,429    
Fair value loss (gain) included in other comprehensive income 910    
Ending balance 21,339 72,000 0
Available-for-Sale Investments, Non-Current [Member]      
Level 3 Instruments Measured at Fair Value on a Recurring Basis [Abstract]      
Beginning balance 56,418 70,374 19,249
Investment     33,000
Impairment loss (51,000) (1,087) (144)
Fair value loss (gain) included in other comprehensive income (5,400) (12,869) 18,269
Ending balance 18 56,418 $ 70,374
Other Assets [Member]      
Level 3 Instruments Measured at Fair Value on a Recurring Basis [Abstract]      
Beginning balance 0    
Acquisition of subsidiaries 8,860    
Addition 13,340    
Disposals (363)    
Write-down (3,713)    
Exchange differences 900    
Ending balance $ 19,024 $ 0