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Property and equipment, net - Property and equipment, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property and equipment, net    
Property and Equipment, gross $ 635,483 $ 499,437
Less accumulated depreciation and amortization (137,148) (121,870)
Property and Equipment, net 498,335 377,567
Office equipment    
Property and equipment, net    
Property and Equipment, gross 14,530 15,303
Laboratory equipment    
Property and equipment, net    
Property and Equipment, gross 74,960 70,510
Computer equipment    
Property and equipment, net    
Property and Equipment, gross 61,964 59,069
Land    
Property and equipment, net    
Property and Equipment, gross 10,447 10,203
Building and leasehold improvements    
Property and equipment, net    
Property and Equipment, gross 206,600 208,293
Operating lease right-of-use assets    
Property and equipment, net    
Property and Equipment, gross 23,862 19,672
Construction in Progress    
Property and equipment, net    
Property and Equipment, gross $ 243,120 $ 116,387