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Balance Sheet Components (Components Of Property and Equipment, Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment $ 70,114 $ 51,589
Less: Accumulated depreciation (32,194) (37,029)
Property and equipment, net 37,920 14,560
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment   1,160
Laboratory Equipment And Machinery [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 24,703 23,337
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 29,728 8,138
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 8,301 7,170
Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 4,615 5,189
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 2,382 823
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 385 $ 5,772