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ACCRUED AND OTHER CURRENT LIABILITIES (Tables)
3 Months Ended
Mar. 31, 2015
Accrued and Other Current Liabilities  
Schedule of accrued and other current liabilities
    December 31,     March 31,  
    2014     2015  
Accrued research and development   $ 4,161     $ 3,401  
Accrued legal and professional fees     303       481  
Other current liabilities     162       172  
    $ 4,626     $ 4,054