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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details) $ in Millions | Sep. 30, 2021 USD ($) Security | Dec. 31, 2020 USD ($) Security
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Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value of Marketable Debt Securities |  | $ 59.4 | $ 48.1
Number of Marketable Debt Securities in a Loss Position | Security |  | 76 | 62
Unrealized Losses | [1] | $ 0.0 | $ 0.0
Corporate Debt Securities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value of Marketable Debt Securities |  | $ 50.0 | $ 42.9
Number of Marketable Debt Securities in a Loss Position | Security |  | 63 | 56
Unrealized Losses | [1] | $ 0.0 | $ 0.0
U.S. Government Agency Securities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value of Marketable Debt Securities |  | $ 0.8 | $ 0.0
Number of Marketable Debt Securities in a Loss Position | Security |  | 2 | 0
Unrealized Losses | [1] | $ 0.0 | $ 0.0
U.S. Treasury Securities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value of Marketable Debt Securities |  | $ 8.1 | $ 1.7
Number of Marketable Debt Securities in a Loss Position | Security |  | 10 | 3
Unrealized Losses | [1] | $ 0.0 | $ 0.0
Certificates of Deposit |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value of Marketable Debt Securities |  | $ 0.5 | $ 1.3
Number of Marketable Debt Securities in a Loss Position | Security |  | 1 | 2
Unrealized Losses | [1] | $ 0.0 | $ 0.0
Commercial Paper |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value of Marketable Debt Securities |  | $ 0.0 | $ 2.2
Number of Marketable Debt Securities in a Loss Position | Security |  | 0 | 1
Unrealized Losses | [1] | $ 0.0 | $ 0.0
[1] | Unrealized losses were insignificant for the periods ended September 30, 2021 and December 31, 2020.

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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 without allowance for credit loss. + 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=123581744&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 (a)(1) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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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=123581744&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=124269663&loc=SL82922888-210455 + Details
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