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Fair Value Measurements - Summary of Placement in the Fair Value Hierarchy of Financial Assets that are Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | $ 139,610 | $ 48,325
Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 139,610 | 48,325
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 0 | 0
U.S. government debt securities |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 139,345 | 48,061
U.S. government debt securities | Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 0 | 0
U.S. government debt securities | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 139,345 | 48,061
U.S. government debt securities | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 0 | 0
Certificates of deposit |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 265 | 264
Certificates of deposit | Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 0 | 0
Certificates of deposit | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 265 | 264
Certificates of deposit | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | $ 0 | $ 0

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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=123874694&loc=d3e19207-110258 + Details
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