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Balance Sheet Components (Components of Property and Equipment, Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment $ 74,790 $ 74,288
Less: Accumulated depreciation (49,891) (44,218)
Property and equipment, net 24,899 30,070
Laboratory Equipment And Machinery [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 24,948 25,173
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 29,931 29,902
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 12,400 11,851
Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 4,940 4,747
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 2,434 2,422
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 137 $ 193