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STATUTORY RESERVE AND RESTRICTED NET ASSETS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
STATUTORY RESERVE AND RESTRICTED NET ASSETS      
Percentage of after-tax profits required to be allocated to general reserve 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%    
Appropriation to enterprise expansion reserve by the company's PRC subsidiaries $ 0 $ 0 $ 0
Restricted net assets $ 107,268 $ 95,228