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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables)
9 Months Ended
Sep. 30, 2015
Prepaid Expenses And Other Current Assets [Abstract]  
Schedule of prepaid expenses and other current assets

 

    December 31,     September 30,  
    2014     2015  
Research and development tax credit receivable   $ 3,017     $ 1,674  
Prepayments     902       963  
Grant receivable     134       304  
Sales tax receivable     309       718  
Deposits     132       132  
Other current assets     146       175  
    $ 4,640     $ 3,966