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Property and Equipment, net - Property and equipment, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property and equipment, net    
Property and Equipment, gross $ 746,075 $ 703,999
Less accumulated depreciation and amortization (151,405) (144,374)
Property and Equipment, net 594,670 559,625 [1]
Office equipment    
Property and equipment, net    
Property and Equipment, gross 18,087 17,880
Laboratory equipment    
Property and equipment, net    
Property and Equipment, gross 89,714 86,021
Computer equipment    
Property and equipment, net    
Property and Equipment, gross 67,625 66,640
Land    
Property and equipment, net    
Property and Equipment, gross 10,328 10,671
Building and leasehold improvements    
Property and equipment, net    
Property and Equipment, gross 244,872 238,042
Operating lease right-of-use assets    
Property and equipment, net    
Property and Equipment, gross 25,099 26,816
Construction in Progress    
Property and equipment, net    
Property and Equipment, gross $ 290,350 $ 257,929
[1] The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date.