Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Property and Equipment (Details)

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Balance Sheet Components - Property and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Total property and equipment $ 5,987 $ 5,530
Less accumulated depreciation and amortization (1,141) (935)
Property and equipment, net 4,846 4,595
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Total property and equipment 3,268 3,268
Furniture, Laboratory and Office Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment 2,489 2,043
Computer Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment $ 230 $ 219