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SHARE-BASED COMPENSATION - Nonvested Restricted Shares of Renren plan (Details) - Renren Plan - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Weighted average fair value per ordinary shares at the granted dates |  |
Share-based compensation cost of the earnout shares | $ 109 | $ 2,390
Weighted average period for unrecognized compensation cost |  | 3 years 14 days
Restricted Stock |  |
Number of nonvested restricted shares |  |
Balance at the beginning of period | 73,772,379 | 10,802,683
Granted |  | 88,935,342
Vested |  | (8,404,575)
Forfeited |  | (17,561,071)
Balance at the end of period |  | 73,772,379
Weighted average fair value per ordinary shares at the granted dates |  |
Balance at the beginning of period | $ 0.21 | $ 0.95
Granted |  | 0.14
Vested |  | 0.47
Forfeited |  | 0.18
Balance at the end of period |  | $ 0.21
Share-based compensation cost of the earnout shares |  | $ 3,917
Total unrecognized compensation cost |  | $ 15,345
Weighted average period for unrecognized compensation cost |  | 5 years 2 months 19 days

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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