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Cash Equivalents and Marketable Securities - Additional Information (Details) - U.S. government and agency securities $ in Millions | Jun. 30, 2019 USD ($) Security | Dec. 31, 2018 USD ($) Security
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Cash Equivalents And Marketable Securities [Line Items] |  |
Fair value of debt securities in an unrealized loss position | $ | $ 22.0 | $ 45.6
Number of securities in a significant unrealized loss position | Security | 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. + References No definition available. + 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 unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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