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Balance Sheet Components (Components of Property and Equipment, Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment $ 71,180 $ 70,114
Less: Accumulated depreciation (37,107) (32,194)
Property and equipment, net 34,073 37,920
Laboratory Equipment And Machinery [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 24,111 24,703
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 29,821 29,728
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 9,484 8,301
Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 4,734 4,615
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 2,422 2,382
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 608 $ 385