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Short-term Investments - Summary of Short-term Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | $ 43,254 | $ 103,096
Available-for-sale securities, gross unrealized gains |  | 257
Available-for-sale securities, gross unrealized losses | (4) |
Available-for-sale securities | 43,250 | 103,353
U.S. Treasury Bills and Government Agency Obligations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost |  | 20,110
Available-for-sale securities, gross unrealized gains |  | 166
Available-for-sale securities |  | 20,276
U.S. Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 4,188 | 11,505
Available-for-sale securities, gross unrealized gains |  | 42
Available-for-sale securities, gross unrealized losses | (2) |
Available-for-sale securities | 4,186 | 11,547
Foreign Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 6,079 | 15,508
Available-for-sale securities, gross unrealized gains |  | 49
Available-for-sale securities, gross unrealized losses | (2) |
Available-for-sale securities | 6,077 | 15,557
U.S. Commercial Paper |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 10,995 | 13,997
Available-for-sale securities | 10,995 | 13,997
Foreign Commercial Paper |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 21,992 | 41,976
Available-for-sale securities | $ 21,992 | $ 41,976

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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