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Marketable Securities - Marketable Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Marketable Securities [Line Items] |  |
Fair Value | $ 242,443 | $ 198,358
Gross Unrealized Loss | (1,911) | (517)
U.S. Treasury securities |  |
Marketable Securities [Line Items] |  |
Fair Value | 179,056 | 143,590
Gross Unrealized Loss | (1,544) | (404)
Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Fair Value | 11,727 | 6,490
Gross Unrealized Loss | (43) | (5)
Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Fair Value | 31,990 | 36,327
Gross Unrealized Loss | (267) | (95)
Commercial paper |  |
Marketable Securities [Line Items] |  |
Fair Value | 14,663 | 6,984
Gross Unrealized Loss | (48) | (6)
Asset-backed securities |  |
Marketable Securities [Line Items] |  |
Fair Value | 5,007 | 4,967
Gross Unrealized Loss | $ (9) | $ (7)

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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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