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Fair Value Measurements - Schedule of Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | $ 296,475 | $ 293,600
Money Market Funds |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | 241,126 | 78,446
U.S. Treasury Securities |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | 53,660 | 215,154
Certificates of deposit |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | 1,689 |
Level 1 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | 296,475 | 293,600
Level 1 | Money Market Funds |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | 241,126 | 78,446
Level 1 | U.S. Treasury Securities |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | 53,660 | 215,154
Level 1 | Certificates of deposit |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | 1,689 |
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | 296,475 | 293,600
Fair Value | Money Market Funds |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | 241,126 | 78,446
Fair Value | U.S. Treasury Securities |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | 53,660 | $ 215,154
Fair Value | Certificates of deposit |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, Fair Value | $ 1,689 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + 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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