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Property and equipment, net - Property and equipment, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property and equipment, net    
Property and Equipment, gross $ 355,374 $ 334,427
Less accumulated depreciation and amortization (87,788) (74,664)
Property and Equipment, net 267,586 259,763 [1]
Office equipment    
Property and equipment, net    
Property and Equipment, gross 16,361 14,674
Laboratory equipment    
Property and equipment, net    
Property and Equipment, gross 57,409 48,807
Computer equipment    
Property and equipment, net    
Property and Equipment, gross 54,191 51,351
Land    
Property and equipment, net    
Property and Equipment, gross 5,350 5,350
Building and leasehold improvements    
Property and equipment, net    
Property and Equipment, gross $ 222,063 $ 214,245
[1] The condensed consolidated balance sheet at December 31, 2017 has been derived from the audited financial statements at that date.