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ACCRUED AND OTHER CURRENT LIABILITIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Payables And Accruals [Abstract]    
Accrued research and development $ 3,420 $ 3,284
Accrued legal and professional fees 170 291
Other current liabilities 149 163
Total $ 3,739 $ 3,738