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Income Taxes - Schedule of Income (loss) Before Income Tax from Discontinued Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income (loss) before income tax from discontinued operations      
Income from discontinued operations, net of tax of nil (note 3) $ 0 $ 0 $ 2,338
Non-PRC      
Income (loss) before income tax from discontinued operations      
Income from discontinued operations, net of tax of nil (note 3) 0 0 0
PRC      
Income (loss) before income tax from discontinued operations      
Income from discontinued operations, net of tax of nil (note 3) $ 0 $ 0 $ 2,338