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Leases - Narrative (Details) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) ft² campus | Dec. 31, 2018 USD ($) | Jun. 01, 2020 ft² | Dec. 31, 2019 USD ($) | Aug. 31, 2019 ft² | Feb. 28, 2019 ft² extension_period | Aug. 31, 2016 ft² extension_period
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of campuses | campus | 2 |  |  |  |  |  |
Lease liabilities | $ 103,393 |  |  |  |  |  |
Right-of-use assets, operating leases | 90,201 |  |  | $ 86,414 |  |  |
Rent expense |  | $ 19,100 |  |  |  |  |
Amounts representing interest or imputed interest, operating lease | 70,354 |  |  |  |  |  |
Amounts representing interest or imputed interest, finance lease | 379,110 |  |  |  |  |  |
Embedded Leases |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Lease liabilities | 24,300 |  |  |  |  |  |
Right-of-use assets, operating leases | $ 62,300 |  |  |  |  |  |
Cambridge Leases |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Area of office space (in sqft) | ft² | 175,000 |  |  |  |  |  |
Cambridge Leases | 200 Technology Square |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Area of office space (in sqft) | ft² |  |  |  |  | 50,000 |  |
Extension term |  |  |  |  | 2 years |  |
Cambridge Leases | 500 Technology Square |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Area of office space (in sqft) | ft² |  |  |  |  | 60,000 |  |
Norwood Leases |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Area of office space (in sqft) | ft² |  |  |  |  |  | 200,000 |
Extension term |  |  |  |  |  | 5 years | 10 years
Number of extension periods | extension_period |  |  |  |  |  | 4 | 2
Percentage subleased |  |  |  |  |  | 64.00% |
Tenant improvements | $ 22,200 |  |  |  |  |  |
Norwood Leases | Office, laboratory, and light manufacturing space |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Area of office space (in sqft) | ft² |  |  |  |  |  |  | 200,000
Amounts representing interest or imputed interest, finance lease | $ 338,900 |  |  |  |  |  |
Norwood Leases | MTC North [Member] |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Percentage subleased |  |  | 12.00% |  |  |  |
Additional space (in sqft) | ft² |  |  | 28,000 |  |  |  |
Incremental borrowing rate | 8.20% |  |  |  |  |  |
Norwood Leases | MTC South |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Imputed interest rate | 17.20% |  |  |  |  |  |

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