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Accrued and Other Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Accrued research and development $ 1,601 $ 1,645
Accrued legal and professional fees 416 248
Other current liabilities 292 662
Total $ 2,309 $ 2,555