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v3.21.1

Leases - Narrative (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 19, 2020 | Mar. 31, 2021 USD ($) ft² item lease | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | May 01, 2020 ft²
Leases |  |  |  |  |
Number of operating leases | lease |  | 3 |  |  |
Operating lease, expense |  | $ 5,400 | $ 2,400 |  |
Aggregate rent, Initial term |  | 140,469 |  |  |
2021 (excludes the three months ended March 31, 2021) |  | 10,242 |  |  |
2022 |  | 13,240 |  |  |
Research and development |  | 134,513 | $ 90,107 |  |
MassBio |  |  |  |  |
Leases |  |  |  |  |
Finance lease cost |  | $ 400 |  |  |
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 |  | 3 months 18 days |  |  |
Maximum |  |  |  |  |
Leases |  |  |  |  |
Operating lease, term of contract |  | 14 years 3 months 18 days |  |  |
Renewal Term |  | 10 years |  |  |
New Building |  |  |  |  |
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 (excludes the three months ended March 31, 2021) |  | $ 1,400 |  |  |
2022 |  | 1,400 |  |  |
Thereafter |  | $ 0 |  |  |
Bridgewater |  |  |  |  |
Leases |  |  |  |  |
Area of real estate property | ft² |  |  |  |  | 59,000

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