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Property and Equipment - Property and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property and equipment, net      
Property and Equipment, gross $ 422,982 $ 334,427  
Less accumulated depreciation and amortization (103,231) (74,664)  
Property and Equipment, net 319,751 259,763  
Depreciation expense including amortization expense of leasehold improvements 32,300 24,600 $ 14,200
Office equipment      
Property and equipment, net      
Property and Equipment, gross 16,955 14,665  
Laboratory equipment      
Property and equipment, net      
Property and Equipment, gross 61,697 45,048  
Computer equipment      
Property and equipment, net      
Property and Equipment, gross 55,436 48,733  
Land      
Property and equipment, net      
Property and Equipment, gross 10,122 5,350  
Building and leasehold improvements      
Property and equipment, net      
Property and Equipment, gross 213,196 209,260  
Construction in Progress      
Property and equipment, net      
Property and Equipment, gross $ 65,576 $ 11,371