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Balance Sheet Details - Summary of Short -Term Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | $ 103,096 | $ 318,989
Available-for-sale securities, gross unrealized gains | 257 | 85
Available-for-sale securities | 103,353 | 319,074
U.S. Treasury Bills and Government Agency Obligations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 20,110 | 140,567
Available-for-sale securities, gross unrealized gains | 166 | 59
Available-for-sale securities | 20,276 | 140,626
U.S. Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 11,505 | 80,159
Available-for-sale securities, gross unrealized gains | 42 | 11
Available-for-sale securities | 11,547 | 80,170
Foreign Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 15,508 | 23,188
Available-for-sale securities, gross unrealized gains | 49 | 15
Available-for-sale securities | 15,557 | 23,203
U.S. Commercial Paper |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 13,997 | 32,801
Available-for-sale securities | 13,997 | 32,801
Foreign Commercial Paper |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 41,976 | 42,274
Available-for-sale securities | $ 41,976 | $ 42,274

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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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