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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables)
9 Months Ended
Sep. 30, 2016
Prepaid Expenses And Other Current Assets [Abstract]  
Schedule of prepaid expenses and other current assets
    December 31,     September 30,  
    2015     2016  
Research and development tax credit receivable   $ 2,093     $ 1,392  
Prepayments     893       845  
Grant receivable     326       249  
Sales tax receivable     607       366  
Deposits     132       132  
Other current assets           1,537  
    $ 4,051     $ 4,521