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ACCRUED AND OTHER CURRENT LIABILITIES (Tables)
9 Months Ended
Sep. 30, 2016
Payables And Accruals [Abstract]  
Schedule of accrued and other current liabilities
    December 31,     September 30,  
    2015     2016  
Accrued research and development   $ 3,284     $ 3,221  
Accrued legal and professional fees     291       208  
Other current liabilities     163       133  
    $ 3,738     $ 3,562