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ORGANIZATION AND PRINCIPAL ACTIVITIES - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Short-term debt $ 15,257 $ 16,630  
Consolidated VIEs      
Percentage of net revenue contributed by VIE 99.00% 99.40% 99.30%
Percentage of consolidated total assets contributed by VIE 90.30% 93.40%  
Percentage of consolidated total liabilities contributed by VIE 82.70% 78.20%  
Consolidated VIEs | WFOE      
Short-term debt $ 13,116 $ 14,630