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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accrued Liabilities    
Accrued offering costs   $ 575
Legal costs $ 54 234
Accrued compensation costs 706 2
Other research and development expenses 1,259 759
Other general and administrative expenses 94 47
Total $ 2,113 $ 1,617