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Leases - Narrative (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 19, 2020 room | Jun. 30, 2021 USD ($) ft² lease item | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) ft² lease item | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Leases |  |  |  |  |  |
Number of operating leases | lease |  | 3 |  | 3 |  |
Operating lease, expense |  | $ 5,200 | $ 2,600 | $ 10,600 | $ 5,000 |
Aggregate rent, Initial term |  | 137,232 |  | 137,232 |  |
2021 (excludes the six months ended June 30, 2021) |  | 6,892 |  | 6,892 |  |
2022 |  | 13,314 |  | 13,314 |  |
Research and development |  | 125,482 | 176,525 | 259,995 | 266,632 |
MassBio |  |  |  |  |  |
Leases |  |  |  |  |  |
Finance lease cost |  | $ 400 | $ 0 | $ 800 | $ 0 |
Written notice required for early lease termination | 24 months |  |  |  |  |
Number of dedicated rooms provided for gene therapy AADC program | room | 4 |  |  |  |  |
Finance lease, term of contract | 12 years 6 months |  |  |  |  |
Research and development |  |  |  |  |  | $ 41,400
Minimum |  |  |  |  |  |
Leases |  |  |  |  |  |
Operating lease, term of contract |  | 6 months |  | 6 months |  |
Maximum |  |  |  |  |  |
Leases |  |  |  |  |  |
Operating lease, term of contract |  | 14 years |  | 14 years |  |
Renewal Term |  | 10 years |  | 10 years |  |
New Building | Minimum |  |  |  |  |  |
Leases |  |  |  |  |  |
Area of real estate property | ft² |  | 75,000 |  | 75,000 |  |
Hopewell Campus |  |  |  |  |  |
Leases |  |  |  |  |  |
Operating lease, term of contract |  | 15 years |  | 15 years |  |
Area of real estate property | ft² |  | 220,500 |  | 220,500 |  |
Renewal Term |  | 10 years |  | 10 years |  |
Number of renewable terms | item |  | 2 |  | 2 |  |
Aggregate rent, Initial term |  | $ 111,500 |  | $ 111,500 |  |
Percent of market rate |  | 95.00% |  | 95.00% |  |
Mountainview |  |  |  |  |  |
Leases |  |  |  |  |  |
2021 (excludes the six months ended June 30, 2021) |  | $ 900 |  | $ 900 |  |
2022 |  | 1,400 |  | 1,400 |  |
Thereafter |  | $ 0 |  | $ 0 |  |

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