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Other Balance Sheet Details - Property and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment $ 86.3 $ 75.5
Less accumulated depreciation (41.7) (33.6)
Total property and equipment, net 44.6 41.9
Tenant improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment 29.5 26.3
Scientific equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 39.2 33.5
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 13.9 12.5
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 3.7 $ 3.2