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
Jun. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Total property and equipment $ 5,353 $ 1,895
Less accumulated depreciation and amortization (548) (355)
Property and equipment, net 4,805 1,540
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Total property and equipment 3,255 155
Furniture, Laboratory and Office Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment 1,978 1,242
Computer Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment $ 120 34
Construction in Progress    
Property Plant And Equipment [Line Items]    
Total property and equipment   $ 464