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Balance Sheet Components - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities    
Research and development services $ 2,709 $ 2,179
Stock option liability   455
Payroll related expenses 150 254
Professional services 115 56
Accrued liabilities $ 2,974 $ 2,944