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Balance Sheets Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Accrued personnel expenses $ 1,805 $ 1,108
Accrued clinical and development expenses 3,215 2,250
Other 340 201
Total $ 5,360 $ 3,559