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Accrued and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accrued and Other Current Liabilities    
Accrued research and development $ 3,284 $ 4,161
Accrued legal and professional fees 291 303
Other current liabilities 163 162
Total $ 3,738 $ 4,626