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Property and Equipment, net - Property and equipment, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Property and equipment, net    
Property and Equipment, gross $ 820,619 $ 703,999
Less accumulated depreciation and amortization (159,259) (144,374)
Property and Equipment, net 661,360 559,625
Office equipment    
Property and equipment, net    
Property and Equipment, gross 18,190 17,880
Laboratory equipment    
Property and equipment, net    
Property and Equipment, gross 100,599 86,021
Computer equipment    
Property and equipment, net    
Property and Equipment, gross 69,863 66,640
Land    
Property and equipment, net    
Property and Equipment, gross 10,435 10,671
Building and leasehold improvements    
Property and equipment, net    
Property and Equipment, gross 263,010 238,042
Operating lease right-of-use assets    
Property and equipment, net    
Property and Equipment, gross 26,953 26,816
Construction in Progress    
Property and equipment, net    
Property and Equipment, gross $ 331,569 $ 257,929