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Property and Equipment, net - Buildings and construction (Details)
$ in Thousands
 1 Months Ended
Jul. 31, 2018
USD ($)
Feb. 28, 2018
ft²
Sep. 30, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Property and equipment, net          
Finance lease right-of-use assets, net     $ 27,133 $ 28,451  
Costs for architectural and engineering studies and initial ground preparation     $ 854,512 $ 703,999  
Office Building in Wilmington, Delaware          
Property and equipment, net          
Square footage | ft²     200,000    
Capitalized construction costs     $ 140,700    
Office Building in Morges, Switzerland          
Property and equipment, net          
Initial lease term   15 years      
Options to extend   true      
Renewal term of agreement to rent   20 years      
Square footage | ft²   100,000      
Financing lease liabilities         $ 31,100
Finance lease right-of-use assets, net         29,100
Finance Lease, Lease Incentive Receivable         $ 2,000
Capitalized construction costs     19,100    
Land in Y-PARC, Switzerland's largest technology park, Yverdon          
Property and equipment, net          
Purchase price $ 4,800        
Costs for architectural and engineering studies and initial ground preparation     $ 186,700