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Balance Sheet Components - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities    
Research and development services $ 2,179 $ 1,713
Stock option liability 455  
Payroll related expenses 254 207
Professional services 56 201
Accrued Liabilities, Current, Total $ 2,944 $ 2,121