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Property and Equipment, Net - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment        
Depreciation expense $ 2.4 $ 1.5 $ 6.5 $ 4.0
Lab equipment        
Property, Plant and Equipment        
Property, plant and equipment, gross, period increase     9.6  
Leasehold improvements        
Property, Plant and Equipment        
Property, plant and equipment, gross, period increase     $ 4.2