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Marketable Securities and Long-Term Investments - Summary of Marketable Securities and Long-Term Investments Held (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities held, Amortized Cost | $ 403,233 | $ 137,509
Marketable securities held, Gross Unrealized Gains | 41 | 13
Marketable securities held, Gross Unrealized Losses | (10) | (22)
Marketable securities held, Fair Value | 403,264 | 137,500
Commercial Paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities held, Amortized Cost | 375,665 | 113,628
Marketable securities held, Gross Unrealized Gains | 41 | 11
Marketable securities held, Gross Unrealized Losses | (7) | (17)
Marketable securities held, Fair Value | 375,699 | 113,622
Corporate Notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities held, Amortized Cost | 27,568 | 7,839
Marketable securities held, Gross Unrealized Gains | 0 | 2
Marketable securities held, Gross Unrealized Losses | (3) | (5)
Marketable securities held, Fair Value | $ 27,565 | 7,836
Government Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities held, Amortized Cost |  | 5,033
Marketable securities held, Gross Unrealized Gains |  | 0
Marketable securities held, Gross Unrealized Losses |  | 0
Marketable securities held, Fair Value |  | 5,033
U.S. Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities held, Amortized Cost |  | 11,009
Marketable securities held, Gross Unrealized Gains |  | 0
Marketable securities held, Gross Unrealized Losses |  | 0
Marketable securities held, Fair Value |  | $ 11,009

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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=121645371&loc=d3e27161-111563 + Details
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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=121645371&loc=d3e27161-111563 + Details
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