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Cash, Cash Equivalents and Investments - Narrative (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 USD ($) investment | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) investment | Jun. 30, 2020 USD ($)
Cash and Cash Equivalents [Abstract] |  |  |  |
Other-than-temporary impairment | $ | $ 0 | $ 0 | $ 0 | $ 0
Investment in continuous unrealized loss position for more than one year | investment | 0 |  | 0 |

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562 + Details
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