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Balance Sheet Details - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Research and development $ 1,206 $ 720
Legal fees 424 20
Unvested share liability 24 54
Compensation 825 85
Other 252 12
Total accrued liabilities $ 2,731 $ 891