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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 |

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