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STATUTORY RESERVES AND RESTRICTED NET ASSETS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
STATUTORY RESERVES AND RESTRICTED NET ASSETS      
Minimum percentage of after-tax profit required to be transferred to general reserve till such reserve reaches specified percentage of registered capital 10.00%    
General reserve as a percentage of registered capital up to which after-tax profit of PRC subsidiaries and VIEs shall be transferred 50.00%    
Discretionary appropriations to enterprise expansion reserve, staff welfare and bonus reserve $ 0 $ 0 $ 0
Amount of restricted net assets of subsidiaries and VIE not available for distribution $ 6,266