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SHARE-BASED COMPENSATION - Renren Plan - Summary of share options outstanding (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of shares      
Balance at the beginning of period 2,154,514    
Exercised (499,456)    
Forfeited (165,264)    
Balance at the end of period 1,489,794 2,154,514  
Exercisable, at the end of period 425,460    
Expected to vest, at the end of period 1,489,794    
Weighted average exercise price      
Balance at the beginning of period $ 0.01    
Forfeited 0.01    
Balance at the end of period 0.02 $ 0.01  
Exercisable, at the end of period 0.01    
Expected to vest, at the end of period 0.01    
Weighted Average grant date fair value per share      
Balance at the beginning of period 3.20    
Forfeited 3.35    
Balance at the end of period $ 3.17 $ 3.20  
Renren Plan      
Number of shares      
Balance at the beginning of period   139,094,101 141,481,616
Exercised     (2,268,420)
Forfeited     (119,095)
Balance at the end of period     139,094,101
Exercisable, at the end of period     117,561,450
Expected to vest, at the end of period     21,532,651
Weighted average exercise price      
Balance at the beginning of period   $ 0.06 $ 0.48
Exercised     0.06
Forfeited     0.16
Balance at the end of period     0.06
Exercisable, at the end of period     0.06
Expected to vest, at the end of period     0.06
Weighted Average grant date fair value per share      
Balance at the beginning of period   $ 0.64 0.64
Exercised     0.66
Forfeited     0.15
Balance at the end of period     $ 0.64
Share-based compensation cost of the earnout shares   $ 109 $ 2,390
Total unrecognized compensation cost     $ 14,285
Weighted average period for unrecognized compensation cost     3 years 14 days
Renren Plan | Continuing operations      
Weighted Average grant date fair value per share      
Share-based compensation cost of the earnout shares     $ 18,640