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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details) $ in Millions | Jun. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
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Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value of Marketable Debt Securities | $ | $ 4.0 | $ 78.1
Number of Marketable Debt Securities in a Loss Position | security | 7 | 71
U.S. Treasury Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value of Marketable Debt Securities | $ |  | $ 14.0
Number of Marketable Debt Securities in a Loss Position | security |  | 9
U.S. Government Agency Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value of Marketable Debt Securities | $ |  | $ 0.8
Number of Marketable Debt Securities in a Loss Position | security |  | 1
Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value of Marketable Debt Securities | $ | $ 4.0 | $ 63.3
Number of Marketable Debt Securities in a Loss Position | security | 7 | 61

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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 unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + 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 (b)(3) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
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