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Balance Sheet Details - Components of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Accrued research and development costs $ 3,634 $ 126
Deferred rent 381  
Other accrued expenses 175 53
Total $ 4,190 $ 179