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ACCRUED AND OTHER CURRENT LIABILITIES (Tables)
6 Months Ended
Jun. 30, 2015
Payables And Accruals [Abstract]  
Schedule of accrued and other current liabilities
    December 31,     June 30,  
    2014     2015  
Accrued research and development   $ 4,161     $ 3,216  
Accrued legal and professional fees     303       297  
Other current liabilities     162       293  
    $ 4,626     $ 3,806