Leases - Additional Information (Detail) $ in Thousands |
1 Months Ended | 3 Months Ended | 12 Months Ended | |||||||
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Nov. 30, 2020 |
Sep. 30, 2020
USD ($)
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Apr. 30, 2019
USD ($)
|
Mar. 31, 2019 |
Jan. 31, 2016
USD ($)
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Oct. 31, 2014
USD ($)
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Dec. 31, 2020
USD ($)
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Mar. 31, 2020
USD ($)
|
Dec. 31, 2020
USD ($)
ft²
USD_per_sqft
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Dec. 31, 2019
USD ($)
|
|
Lessee Lease Description [Line Items] | ||||||||||
Increase in operating lease right-of-use assets | $ 400 | $ (6,457) | $ (5,728) | |||||||
Increase in operating lease, liability | $ 400 | |||||||||
Operating lease right-of-use assets | $ 39,114 | 39,114 | $ 19,137 | |||||||
Operating lease, liability | $ 39,305 | $ 39,305 | ||||||||
130 Brookline Street [Member] | ||||||||||
Lessee Lease Description [Line Items] | ||||||||||
Operating lease, description | In October 2014, the Company entered into an agreement to lease office and laboratory space at 130 Brookline Street (the “130 Brookline Lease”) in Cambridge, Massachusetts under an operating lease agreement with a term through January 2020, with an option to extend the term of the lease for an additional five-year period. In April 2019, the Company executed an amendment to the lease to extend the term of the lease for the additional five-year period, through January 2025. | |||||||||
Operating lease expiration | 2020-01 | |||||||||
Lessee operating lease extended expiration date | Jan. 31, 2025 | |||||||||
Operating lease, existence of option to extend | true | |||||||||
Operating lease, options to extend | option to extend the term of the lease for an additional five-year period. In April 2019, the Company executed an amendment to the lease to extend the term of the lease for the additional five-year period, through January 2025. | |||||||||
Operating lease, renewal term | 5 years | 5 years | ||||||||
Lessee operating sublease option to extend | two options to extend the agreement by one year each, for a total option period of up to two years. | |||||||||
Operating sublease expiration | 2021-04 | |||||||||
Operating sublease, existence of option to extend | true | |||||||||
Operating lease right-of-use assets | $ 1,300 | |||||||||
Operating lease, liability | $ 1,300 | |||||||||
130 Brookline Street [Member] | Maximum [Member] | ||||||||||
Lessee Lease Description [Line Items] | ||||||||||
Operating sublease, renewal term | 2 years | |||||||||
130 Brookline Street [Member] | Second Amendment [Member] | ||||||||||
Lessee Lease Description [Line Items] | ||||||||||
Operating lease, description | In March 2020, the Company entered into a second amendment to the 130 Brookline Lease (the “130 Brookline Lease Second Amendment”). The 130 Brookline Lease Second Amendment amends certain terms of the Company’s existing lease, dated October 21, 2014, as amended on April 5, 2019. The 130 Brookline Lease Second Amendment extends the term of the 130 Brookline Lease by approximately six years through January 31, 2031. | |||||||||
Lessee operating lease extended expiration date | Jan. 31, 2031 | |||||||||
Operating lease, existence of option to extend | true | |||||||||
Operating lease, options to extend | an option to extend the lease for two consecutive five-year terms. | |||||||||
Operating lease, renewal term | 6 years | 6 years | ||||||||
Increase in operating lease right-of-use assets | $ 7,300 | |||||||||
Increase in operating lease, liability | $ 7,300 | |||||||||
130 Brookline Street [Member] | Other Assets [Member] | ||||||||||
Lessee Lease Description [Line Items] | ||||||||||
Lease security deposit | $ 300 | |||||||||
40 Erie Street [Member] | ||||||||||
Lessee Lease Description [Line Items] | ||||||||||
Operating lease, description | In January 2016, the Company entered into a ten-year agreement to lease office and laboratory space at 40 Erie Street (the “40 Erie Lease”) in Cambridge, Massachusetts under an operating lease agreement, with an option to terminate the lease at the end of the sixth year and an option to extend the term of the lease for an additional three years. | |||||||||
Operating lease, existence of option to extend | true | |||||||||
Operating lease, options to extend | option to extend the term of the lease for an additional three years. | |||||||||
Operating lease, renewal term | 3 years | |||||||||
Operating lease, term of contract | 10 years | |||||||||
Operating lease, existence of option to terminate | true | |||||||||
Operating lease, option to terminate | option to terminate the lease at the end of the sixth year | |||||||||
Operating lease, terminate term | 6 years | |||||||||
40 Erie Street [Member] | Second Amendment [Member] | ||||||||||
Lessee Lease Description [Line Items] | ||||||||||
Operating lease, description | In November 2020, the Company entered into a second amendment to the 40 Erie Lease (the “40 Erie Lease Second Amendment”). The 40 Erie Street Second Amendment amends certain terms of the Company’s existing lease, dated January 6, 2016, as amended on November 12, 2020. The 40 Erie Lease Second Amendment provides the Company with a right of first offer with respect to any space that becomes available at the 40 Erie Street building, and in consideration for this right the Company has agreed to nullify the option to terminate the lease at the end of the sixth year that was included in the 40 Erie Lease. | |||||||||
Operating lease, existence of option to extend | true | |||||||||
Increase in operating lease right-of-use assets | $ 18,500 | |||||||||
Increase in operating lease, liability | $ 18,500 | |||||||||
Operating lease, option to terminate | option to terminate the lease at the end of the sixth year | |||||||||
Operating lease, terminate term | 6 years | |||||||||
40 Erie Street [Member] | Other Assets [Member] | ||||||||||
Lessee Lease Description [Line Items] | ||||||||||
Lease security deposit | $ 2,200 | |||||||||
Albany Lease [Member] | ||||||||||
Lessee Lease Description [Line Items] | ||||||||||
Area of space leased | ft² | 39,000 | |||||||||
Operating lease, description | In March 2020, the Company entered into an agreement to lease approximately 39,000 square feet of office and laboratory space at 281 Albany Street in Cambridge, Massachusetts under an operating lease agreement (the “281 Albany Lease”). The Company’s obligation to pay rent will start on the date that is six months after the commencement date or the date on which the Company occupies the premises, whichever occurs earlier (the “Rent Commencement Date”). | |||||||||
Term of lease | 10 years | 10 years | ||||||||
Base rent per square foot for first year | USD_per_sqft | 99.00 | |||||||||
Base rent per square foot for last year | USD_per_sqft | 128.87 | |||||||||
Amount receivable on cost of construction and tenant improvement | $ 4,400 | |||||||||
Letter of credit | $ 1,900 | $ 1,900 | ||||||||
Operating lease, existence of option to extend | true | |||||||||
Operating lease, options to extend | The Company has the option to extend the 281 Albany Lease for two successive five-year terms. |