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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables)
6 Months Ended
Jun. 30, 2014
Prepaid Expenses And Other Current Assets [Abstract]  
Schedule of prepaid expenses and other current assets
    December 31,     June 30,  
    2013     2014  
Research and development tax credit receivable   $ 1,744     $ 1,374  
Prepayments     427       1,015  
Grant receivable     357       202  
Sales tax receivable     209       378  
Deposits     132       128  
Other current assets     519       325  
    $ 3,388     $ 3,422