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Balance Sheet Details - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Payroll and related liabilities $ 736 $ 861
Professional fees 1,110 268
Research and development costs 2,697 1,086
Other 785 120
Total $ 5,328 $ 2,335