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Taxation (Deferred Tax Assets and Liabilities, Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:        
Net operating loss from operations $ 291,380 $ 325,797    
Accrued bonus and commissions 9,101 10,613    
Intangible assets transfer 485 690    
Others 7,489 8,692    
Total deferred tax assets 308,455 345,792    
Less: Valuation allowance (289,097) (326,755) $ (283,711) $ (250,524)
Net deferred tax assets 19,358 19,037    
Deferred tax liabilities        
Withholding tax for dividend (237,116) (206,594)    
Others (12,049) (10,999)    
Total deferred tax liabilities $ (249,165) $ (217,593)