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v3.20.4

Commitments and Contingencies (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 05, 2020 USD ($) | Nov. 30, 2019 USD ($) | Feb. 28, 2018 USD ($) ft² | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2015
Leased assets |  |  |  |  |  |
Rent for facility lease |  |  |  | $ 3,200 | $ 1,400 |
Letter of credit |  |  |  | 2,500 |  |
Lease Cost: |  |  |  |  |  |
Operating lease cost |  |  |  | 3,229 |  |
Variable lease cost |  |  |  | 1,027 |  |
Total lease cost |  |  |  | 4,256 |  |
Operating cash flows used for operating leases |  |  |  | $ 2,111 |  |
Weighted average remaining lease term |  |  |  | 4 years 4 months 24 days |  |
Weighted average incremental borrowing rate |  |  |  | 7.50% |  |
620 Memorial Drive, Cambridge MA |  |  |  |  |  |
Leased assets |  |  |  |  |  |
Term of lease |  |  |  |  |  | 5 years
Option to extend the term |  |  | true |  |  |
Area of lease space | ft² |  |  | 20,751 |  |  |
Renewal term |  |  | 5 years |  |  |
Sublease annual base rent | $ 1,900 |  |  |  |  |
620 Memorial Drive, Cambridge MA | Minimum |  |  |  |  |  |
Leased assets |  |  |  |  |  |
Rent for facility lease |  |  | $ 1,400 |  |  |
620 Memorial Drive, Cambridge MA | Maximum |  |  |  |  |  |
Leased assets |  |  |  |  |  |
Rent for facility lease |  |  | $ 1,700 |  |  |
301 Binney St, Cambridge MA |  |  |  |  |  |
Leased assets |  |  |  |  |  |
Option to extend the term |  | true |  |  |  |
Renewal term |  | 2 years |  |  |  |
Base rent |  | $ 6,900 |  |  |  |
Annual upward adjustment (as a percent) |  | 3.50% |  |  |  |
Incentive to lease |  | $ 14,100 |  |  |  |
Letter of credit |  | $ 2,300 |  |  |  |

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