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FAIR VALUE MEASUREMENT - WARRANTS TO PURCHASE ORDINARY SHARES (Details) - Warrant to purchase Ordinary Shares
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Warrants Liabilities Roll Forward  
Balance, beginning of the period $ 7,078
Revaluation of fair value of warrants to purchase Ordinary Shares 12,715
Balance, end of the period $ 19,793