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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, 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 |  | $ 46.4 | $ 48.1
Number of Marketable Debt Securities in a Loss Position | Security |  | 63 | 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 |  | $ 35.0 | $ 42.9
Number of Marketable Debt Securities in a Loss Position | Security |  | 47 | 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 |  | $ 1.3 | $ 0.0
Number of Marketable Debt Securities in a Loss Position | Security |  | 3 | 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 |  | $ 9.8 | $ 1.7
Number of Marketable Debt Securities in a Loss Position | Security |  | 12 | 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 |  | $ 0.3 | $ 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 June 30, 2021 and December 31, 2020.

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