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Leases - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2020 USD ($) Term | May 31, 2020 Term | Dec. 31, 2019 | May 31, 2019 | May 31, 2016 | Jun. 30, 2015 | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  | $ 174,460 | $ 50,865
Operating lease liability |  |  |  |  |  |  | $ 225,030 | $ 61,429
2015 Lease [Member] |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Lease commencement date |  |  |  |  |  | Nov. 15, 2015 |  |
Lessee, operating lease, existence of option to extend |  |  |  |  |  | false |  |
Lessee, operating lease, option to extend |  |  |  |  |  |  | expires in 2022 with no further option to extend |
Lease expiration year |  |  |  |  |  | 2022 |  |
2016 Sublease [Member] |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Lease commencement date |  |  |  |  | Dec. 23, 2016 |  |  |
Lease expiration year |  |  |  |  | 2022 |  |  |
2019 Lease [Member] |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Lease commencement date |  |  |  | Jun. 01, 2019 |  |  |  |
Lessee, operating lease, existence of option to extend |  |  |  | true |  |  |  |
Lessee, operating lease, option to extend |  |  |  |  |  |  | an option to extend the term of the lease for an additional five-year period based on certain conditions within the Company’s control. |
Lease expiration, month and year |  |  |  | 2026-11 |  |  |  |
Extended term of lease expiration |  |  |  | 5 years |  |  |  |
2019 Sublease [Member] |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Lessee, operating lease, option to extend |  |  |  |  |  |  | expires in 2022 with no further option to extend |
Lease expiration year |  |  | 2022 |  |  |  |  |
Framingham Lease [Member] |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Lease expiration, month and year |  | 2036-03 |  |  |  |  |  |
Lessee, operating sublease, existence of option to extend |  | true |  |  |  |  |  |
Number of additional renewal terms | Term |  | 2 |  |  |  |  |  |
Lease renewal term under each extension option |  | 7 years |  |  |  |  |  |
2020 Boston Lease [Member] |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |
Lessee, operating lease, existence of option to extend | true |  |  |  |  |  |  |
Lessee, operating lease, option to extend |  |  |  |  |  |  | an option to extend the term of the lease for two additional five-year periods |
Lease expiration, month and year | 2034-03 |  |  |  |  |  |  |
Extended term of lease expiration | 5 years |  |  |  |  |  |  |
Number of additional renewal terms | Term | 2 |  |  |  |  |  |  |
Operating lease, right-of-use asset | $ 149,800 |  |  |  |  |  |  |
Operating lease liability | 147,900 |  |  |  |  |  |  |
Tenant incentives | $ 49,200 |  |  |  |  |  |  |

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- Definition Lease expiration month and year. + References No definition available. + Details
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- Definition Lease renewal term under each extension option. + References No definition available. + Details
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- Definition Amount of incentive received by lessee from lessor. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123415192&loc=d3e39896-112707 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 30 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123388062&loc=SL77916639-209961 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123386226&loc=d3e41620-112719 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123415192&loc=d3e40010-112707 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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