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Accrued and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued and Other Current Liabilities    
Accrued research and development $ 1,645 $ 2,138
Accrued legal and professional fees 248 194
Other current liabilities 662 430
Total $ 2,555 $ 2,762