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Property and Equipment - Narrative (Details)
$ in Thousands
1 Months Ended
Feb. 28, 2018
ft²
Jul. 31, 2018
USD ($)
Feb. 28, 2018
ft²
Oct. 31, 2017
USD ($)
ft²
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Property and equipment, net            
Costs for architectural and engineering studies and initial ground preparation         $ 422,982 $ 334,427
Land            
Property and equipment, net            
Costs for architectural and engineering studies and initial ground preparation         10,122 5,350
Construction in Progress            
Property and equipment, net            
Costs for architectural and engineering studies and initial ground preparation         65,576 11,371
Building and leasehold improvements            
Property and equipment, net            
Costs for architectural and engineering studies and initial ground preparation         213,196 $ 209,260
Office Building in Wilmington, Delaware | Building            
Property and equipment, net            
Square footage | ft²       154,000    
Office building       $ 91,300    
Estimated useful life       P40Y    
Office Building in Morges, Switzerland | Building and leasehold improvements            
Property and equipment, net            
Initial term of agreement to rent 15 years   15 years      
Renewal term of agreement to rent 20 years   20 years      
Pending Land and Building Acquisition | Office Building in Morges, Switzerland            
Property and equipment, net            
Square footage | ft² 100,000   100,000      
Pending Land and Building Acquisition | Office Building in Morges, Switzerland | Construction in Progress            
Property and equipment, net            
Capital assets         2,900  
Pending Land and Building Acquisition | Office Building in Morges, Switzerland | Building and leasehold improvements            
Property and equipment, net            
Capital assets         15,800  
Pending Land and Building Acquisition | Land in Y-PARC, Switzerland's largest technology park, Yverdon | Land            
Property and equipment, net            
Purchase price   $ 4,800        
Pending Land and Building Acquisition | Land in Y-PARC, Switzerland's largest technology park, Yverdon | Construction in Progress            
Property and equipment, net            
Office building         $ 37,500