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Balance Sheet Components - Components of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Total property and equipment, gross $ 10,474 $ 9,286
Less: accumulated depreciation and amortization (3,614) (3,065)
Total property and equipment, net 6,860 6,221
Laboratory and Manufacturing Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment, gross 2,236 1,994
Computer Equipment and Software    
Property Plant And Equipment [Line Items]    
Total property and equipment, gross 1,064 1,015
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Total property and equipment, gross 953 953
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Total property and equipment, gross 726 726
Internal-Use Software    
Property Plant And Equipment [Line Items]    
Total property and equipment, gross $ 5,495 $ 4,598