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Property and equipment, net - Narrative (Details) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2018 USD ($) | Feb. 28, 2018 ft² | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property and equipment, net |  |  |  |
Costs for architectural and engineering studies and initial ground preparation |  |  | $ 451,788 | $ 422,982
Land |  |  |  |
Property and equipment, net |  |  |  |
Costs for architectural and engineering studies and initial ground preparation |  |  | 10,068 | 10,122
Construction in Progress |  |  |  |
Property and equipment, net |  |  |  |
Costs for architectural and engineering studies and initial ground preparation |  |  | 64,598 | 65,576
Building and leasehold improvements |  |  |  |
Property and equipment, net |  |  |  |
Costs for architectural and engineering studies and initial ground preparation |  |  | 213,529 | $ 213,196
Office Building in Morges, Switzerland | Construction in Progress |  |  |  |
Property and equipment, net |  |  |  |
Site preparation, design and construction costs |  |  | 2,000 |
Office Building in Morges, Switzerland | Building and leasehold improvements |  |  |  |
Property and equipment, net |  |  |  |
Initial term of agreement to rent |  | 15 years |  |
Renewal term of agreement to rent |  | 20 years |  |
Pending Land and Building Acquisition | Office Building in Morges, Switzerland | Building and leasehold improvements |  |  |  |
Property and equipment, net |  |  |  |
Square footage | ft² |  | 100,000 |  |
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 |  |  |  |
Costs for architectural and engineering studies and initial ground preparation |  |  | $ 55,800 |

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