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Balance Sheet Account Details - Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property and equipment , gross $ 10,035 $ 7,537  
Less accumulated depreciation and amortization (2,850) (2,165)  
Property and equipment, net 7,185 5,372  
Depreciation expense 1,500 900 $ 400
Lab and office equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment , gross 6,307 4,183  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment , gross 2,729 2,418  
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Property and equipment , gross $ 999 $ 936  
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