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FAIR VALUE MEASUREMENTS - Reconciliation of the beginning and ending balances for contingent consideration measured at fair value on a recurring basis using significant unobservable (Details) - Contingent consideration
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at beginning of the year $ 105,670
Fair value change (65,594)
Exchange difference 2,466
Contingent liability assumed by Renren (42,542)
Balance at end of the year $ 0