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Leases - Additional Information (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 ft² | Dec. 31, 2017 ft² | Nov. 30, 2015 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 31, 2018 ft²
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease option to terminate |  |  | true | true |  |
Letter of credit |  |  |  | $ 878 |  |
Letter of credit expiry date |  |  |  | Sep. 30, 2028 |  |
Operating lease, payments |  |  |  | $ 4,878 | $ 2,602 |
Weighted-average remaining lease term |  |  |  | 8 years 3 months 18 days | 9 years 3 months 18 days |
Weighted-average discount rate |  |  |  | 10.40% | 10.40% |
215 First Street [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease agreement expiration date |  |  | 2020-12 |  |  |
399 Binney Street [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease agreement expiration date | 2029-04 | 2029-04 |  |  |  |
Land subject to ground leases | ft² | 1,824 | 44,336 |  |  |  | 44,807

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