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INCOME TAXES - Movements of valuation allowances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Rollforward of valuation allowances of deferred tax assets      
Balance as of beginning of year $ 25,240 $ 388 $ 402
Current year addition 5,267 1,454 63
Current year reversal (7,039) (753)  
Reduction due to usage of NOL (42) (25) (21)
Reduction due to statute expiration (288) (193) (56)
Decrease in disposal of subsidiaries (22,077)    
Reverse acquisition   23,843  
Exchange rate effect   526  
Balance as of the end of the year $ 1,061 $ 25,240 $ 388