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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables)
3 Months Ended
Mar. 31, 2015
Prepaid Expenses And Other Current Assets [Abstract]  
Schedule of prepaid expenses and other current assets
    December 31,     March 31,  
    2014     2015  
Research and development tax credit receivable   $ 3,017     $ 3,628  
Prepayments     902       813  
Grant receivable     134       206  
Sales tax receivable     309       671  
Deposits     132       132  
Other current assets     146       64  
    $ 4,640     $ 5,514