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Cash Equivalents and Marketable Securities - Additional Information (Details) - U.S. government and agency securities $ in Millions | Sep. 30, 2018 USD ($) Security | Dec. 31, 2017 USD ($) Security
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Cash Equivalents And Marketable Securities [Line Items] |  |
Fair value of debt securities in an unrealized loss position | $ | $ 31.5 | $ 37.5
Number of securities in a significant unrealized loss position | Security | 0 | 0

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- Definition Cash equivalents and marketable securities. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Details
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