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Property and Equipment, net - Buildings and construction (Details)
$ in Thousands
 1 Months Ended
Jul. 31, 2018
USD ($)
Feb. 28, 2018
ft²
Jun. 30, 2021
USD ($)
ft²
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Property and equipment, net            
Finance lease right-of-use assets, net     $ 27,683   $ 28,451  
Costs for architectural and engineering studies and initial ground preparation     $ 820,619   $ 703,999  
Office Building in Wilmington, Delaware            
Property and equipment, net            
Square footage | ft²     200,000      
Capitalized construction costs     $ 125,600      
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     $ 188,800