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

 

    December 31,     June 30,  
    2014     2015  
Research and development tax credit receivable   $ 3,017     $ 1,222  
Prepayments     902       1,091  
Grant receivable     134       209  
Sales tax receivable     309       694  
Deposits     132       132  
Other current assets     146       105  
    $ 4,640     $ 3,453