Annual report pursuant to Section 13 and 15(d)

Balance Sheet Account Details - Property and Equipment (Details)

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Balance Sheet Account Details - Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Property and equipment , gross $ 7,537 $ 6,074  
Less accumulated depreciation and amortization (2,165) (1,862)  
Property and equipment, net 5,372 4,212  
Depreciation expense 900 400 $ 200
Lab and office equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment , gross 4,183 3,460  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment , gross 2,418 1,917  
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Property and equipment , gross $ 936 $ 697  
Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 3 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 10 years