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Property and equipment, net - Property and equipment, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property and equipment, net    
Property and Equipment, gross $ 473,766 $ 422,982
Less accumulated depreciation and amortization (126,516) (103,231)
Property and Equipment, net 347,250 319,751
Office equipment    
Property and equipment, net    
Property and Equipment, gross 15,224 16,955
Laboratory equipment    
Property and equipment, net    
Property and Equipment, gross 66,700 61,697
Computer equipment    
Property and equipment, net    
Property and Equipment, gross 56,743 55,436
Land    
Property and equipment, net    
Property and Equipment, gross 10,069 10,122
Building and leasehold improvements    
Property and equipment, net    
Property and Equipment, gross 211,342 213,196
Operating lease right-of-use assets    
Property and equipment, net    
Property and Equipment, gross 30,479  
Construction in Progress    
Property and equipment, net    
Property and Equipment, gross $ 83,209 $ 65,576