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Property and Equipment, net - Property and equipment, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property and equipment, net    
Property and Equipment, gross $ 854,512 $ 703,999
Less accumulated depreciation and amortization (167,794) (144,374)
Property and Equipment, net 686,718 559,625
Office equipment    
Property and equipment, net    
Property and Equipment, gross 18,395 17,880
Laboratory equipment    
Property and equipment, net    
Property and Equipment, gross 103,502 86,021
Computer equipment    
Property and equipment, net    
Property and Equipment, gross 75,105 66,640
Land    
Property and equipment, net    
Property and Equipment, gross 10,379 10,671
Building and leasehold improvements    
Property and equipment, net    
Property and Equipment, gross 277,901 238,042
Operating lease right-of-use assets    
Property and equipment, net    
Property and Equipment, gross 25,544 26,816
Construction in Progress    
Property and equipment, net    
Property and Equipment, gross $ 343,686 $ 257,929