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SHARE-BASED COMPENSATION- Schedule of Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Outstanding, beginning balance 68,565,920 93,846,550  
Granted   0  
Forfeited (5,655,230) (16,014,140)  
Exercised (748,730) (9,151,290)  
Expired (231,520) (115,200)  
Outstanding, ending balance 61,930,440 68,565,920 93,846,550
Vested and expected to vest 61,930,440    
Exercisable 59,693,900    
Weighted average exercise price, outstanding $ 0.22 $ 0.19  
Weighted average exercise price, granted   0  
Weighted average exercise price, forfeited 0.26 0.11  
Weighted Average Exercise Price,exercised 0.10 0.10  
Weighted Average exercise price, expired 0.28 0.14  
Weighted average exercise price, outstanding $ 0.21 $ 0.22 $ 0.19
Weighted average remaining contractual term, outstanding 1 year 8 months 23 days 2 years 7 months 24 days 3 years 9 months 7 days
Aggregate intrinsic value, outstanding beginning balance   $ 30,442  
Aggregate intrinsic value, outstanding ending balance $ 0 $ 2,826