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v3.21.2

Leases - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 19, 2020 USD ($) room | Sep. 30, 2021 USD ($) ft² lease item | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) ft² lease item | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Leases |  |  |  |  |  |
Number of operating leases | lease |  | 3 |  | 3 |  |
Operating lease, expense |  | $ 5,300 | $ 5,200 | $ 15,900 | $ 10,200 |
Finance lease liabilities- current |  | 2,557 |  | 2,557 |  | $ 1,276
Finance lease liabilities- noncurrent |  | 20,053 |  | 20,053 |  | 23,053
Aggregate rent, Initial term |  | 133,641 |  | 133,641 |  |
2021 (excludes the nine months ended September 30, 2021) |  | 3,417 |  | 3,417 |  |
2022 |  | 13,235 |  | 13,235 |  |
Finance Lease, Right-of-Use Asset |  | 0 |  | 0 |  |
Research and development |  | 130,845 | 92,998 | 390,840 | 359,630 |
MassBio |  |  |  |  |  |
Leases |  |  |  |  |  |
Finance lease cost |  | $ 400 | $ 500 | $ 1,300 | $ 500 |
Written notice required for early lease termination | 24 months |  |  |  |  |
Number of dedicated rooms provided for gene therapy AADC program | room | 4 |  |  |  |  |
Guaranteed lease payment due at onset of the lease agreement | $ 15,000 |  |  |  |  |
Guaranteed lease payments due annually | 3,000 |  |  |  |  |
Present value of guaranteed lease payments | $ 41,400 |  |  |  |  |
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 |  | 3 months 18 days |  |
Maximum |  |  |  |  |  |
Leases |  |  |  |  |  |
Operating lease, term of contract |  | 13 years 9 months 18 days |  | 13 years 9 months 18 days |  |
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 nine months ended September 30, 2021) |  | $ 500 |  | $ 500 |  |
2022 |  | 1,400 |  | 1,400 |  |
Thereafter |  | $ 0 |  | $ 0 |  |

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