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ACCRUED AND OTHER CURRENT LIABILITIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Payables And Accruals [Abstract]    
Accrued research and development $ 3,216 $ 4,161
Accrued legal and professional fees 297 303
Other current liabilities 293 162
Total $ 3,806 $ 4,626