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Accrued and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accrued and Other Current Liabilities    
Accrued research and development $ 2,138 $ 3,284
Accrued legal and professional fees 194 291
Other current liabilities 430 238
Total $ 2,762 $ 3,813