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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

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