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SHARE-BASED COMPENSATION - Renren Plan - Summary of share options outstanding with range of exercise prices (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 139,094,101
Options outstanding, Weighted average intrinsic value | $ $ 5,754
Options exercisable, Number of exercisable | shares 117,561,450
Options exercisable, Weighted average intrinsic value | $ $ 4,863
Renren Plan | $0.01 ~ $0.18  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower limit | $ / shares $ 0.01
Range of exercise prices, upper limit | $ / shares $ 0.18
Options outstanding, Number outstanding | shares 139,094,101
Options outstanding, Weighted average remaining contractual life 5 years 4 months 24 days
Options outstanding, Weighted average exercise price | $ / shares $ 0.06
Options outstanding, Weighted average intrinsic value | $ $ 5,754
Options exercisable, Number of exercisable | shares 117,561,450
Options exercisable, Weighted average remaining contractual life 5 years 1 month 9 days
Options exercisable, Weighted average exercise price | $ / shares $ 0.06
Options exercisable, Weighted average intrinsic value | $ $ 4,863