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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables)
9 Months Ended
Sep. 30, 2014
Prepaid Expenses And Other Current Assets [Abstract]  
Schedule of prepaid expenses and other current assets

 

    December 31,     September 30,  
    2013     2014  
Research and development tax credit receivable   $ 1,744     $ 2,014  
Prepayments     427       821  
Grant receivable     357       265  
Sales tax receivable     209       552  
Deposits     132       132  
Other current assets     519       418  
    $ 3,388     $ 4,202