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v3.20.4

Leases - Narrative (Details) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 19, 2020 | Dec. 31, 2020 USD ($) ft² lease | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 01, 2020 USD ($) ft² item | May 01, 2020 ft²
Leases |  |  |  |  |  |
Number of operating leases | lease |  | 3 |  |  |  |
Operating lease, expense |  | $ 15,300 | $ 6,000 | $ 2,700 |  |
Renewal Term |  | 10 years |  |  |  |
Aggregate rent, Initial term |  | $ 144,075 |  |  |  |
2021 |  | 13,721 |  |  |  |
2022 |  | 13,301 |  |  |  |
Fixed lease cost |  | 12,368 | 4,929 |  |  |
Research and development |  | 477,643 | $ 257,452 | $ 171,984 |  |
MassBio |  |  |  |  |  |
Leases |  |  |  |  |  |
Finance lease expense |  | 900 |  |  |  |
Written notice required for early lease termination | 24 months |  |  |  |  |
Finance lease, term of contract | 12 years 6 months |  |  |  |  |
Research and development |  | $ 41,400 |  |  |  |
Minimum |  |  |  |  |  |
Leases |  |  |  |  |  |
Operating lease, term of contract |  | 1 month 6 days |  |  |  |
Maximum |  |  |  |  |  |
Leases |  |  |  |  |  |
Operating lease, term of contract |  | 14 years 6 months |  |  |  |
New Building | Minimum |  |  |  |  |  |
Leases |  |  |  |  |  |
Area of real estate property | ft² |  | 75,000 |  |  |  |
Hopewell Campus |  |  |  |  |  |
Leases |  |  |  |  |  |
Operating lease, term of contract |  |  |  |  | 15 years |
Area of real estate property | ft² |  |  |  |  | 220,500 |
Renewal Term |  |  |  |  | 10 years |
Number of renewable terms | item |  |  |  |  | 2 |
Aggregate rent, Initial term |  |  |  |  | $ 111,500 |
Percent of market rate |  |  |  |  | 95.00% |
Mountainview |  |  |  |  |  |
Leases |  |  |  |  |  |
2021 |  | $ 1,800 |  |  |  |
2022 |  | 1,400 |  |  |  |
Thereafter |  | $ 0 |  |  |  |
Bridgewater |  |  |  |  |  |
Leases |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  | 59,000

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