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Accrued and Other Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Accrued research and development $ 1,855 $ 2,138
Accrued legal and professional fees 271 194
Other current liabilities 350 430
Total $ 2,476 $ 2,762