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Cash Equivalents and Marketable Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | $ 300,386 | $ 322,831
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 230,594 | 206,960
Unrealized Gains | 6 | 296
Unrealized Losses | (540) | (49)
Aggregate Fair Value | 230,060 | 207,207
Cash and cash equivalents | 300,386 | 322,831
Cash and cash equivalents and available-for-sale securities, amortized cost | 491,848 | 487,538
Cash and cash equivalents and available-for-sale securities | 491,314 | 487,785
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,479 | 21,489
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Aggregate Fair Value | 10,479 | 21,489
U.S. treasury debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized Gains | 2 | 80
Unrealized Losses | (206) | (2)
Cash and cash equivalents and available-for-sale securities, amortized cost | 54,809 | 51,731
Cash and cash equivalents and available-for-sale securities | 54,605 | 51,809
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 161,792 | 147,715
Unrealized Gains | 3 | 214
Unrealized Losses | (334) | (47)
Aggregate Fair Value | 161,461 | 147,882
Foreign government debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,014 | 1,025
Unrealized Gains | 1 | 2
Unrealized Losses | 0 | 0
Aggregate Fair Value | 5,015 | 1,027
Money market funds |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | 259,754 | 265,578
Cash and cash equivalents, aggregate fair value | 259,754 | 265,578
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 259,754 | 265,578
Cash and cash equivalents, aggregate fair value | 259,754 | 265,578
Cash Equivalents |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | 261,254 | 280,578
Cash and cash equivalents, aggregate fair value | 261,254 | 280,578
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents | 261,254 | 280,578
Cash and cash equivalents, aggregate fair value | $ 261,254 | $ 280,578

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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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