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Leases - Narrative (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 USD ($) ft² renewal_option | Jun. 30, 2020 USD ($)
Lessee, Lease, Description [Line Items] |  |
Right-of-use assets obtained in exchange for lease obligations | $ 14,379 | $ 0
Fremont facility amendment |  |
Lessee, Lease, Description [Line Items] |  |
Office space area (sq ft) | ft² | 72,500 |
Right-of-use assets obtained in exchange for lease obligations | $ 11,900 |
Waltham facility |  |
Lessee, Lease, Description [Line Items] |  |
Office space area (sq ft) | ft² | 12,864 |
Right-of-use assets obtained in exchange for lease obligations | $ 1,600 |
Existence of option to extend | true |
Number of options to extend | renewal_option | 1 |
Term of lease extension | 5 years |

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- Definition Lessee, Operating Lease, Number Of Renewal Options + References No definition available. + Details
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- Definition Area of a real estate property. + References No definition available. + 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 Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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- Details
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- Details
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