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Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued Liabilities Current [Abstract]    
Personnel expenses $ 778 $ 1,261
Professional fees 287 96
Research and development expenses 7,035 4,410
Other 53 50
Total accrued expenses and other current liabilities $ 8,153 $ 5,817