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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, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities   $ 134.6
Number of Marketable Debt Securities in a Loss Position | Security   187
Unrealized Losses [1]   $ 0.4
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months $ 129.8  
Unrealized Losses Less Than 12 Months $ 2.6  
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security 194  
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer $ 12.9  
Unrealized Losses 12 Months Or Longer $ 0.6  
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security 17  
U.S. Treasury Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities   $ 22.4
Number of Marketable Debt Securities in a Loss Position | Security   27
Unrealized Losses [1]   $ 0.1
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months $ 23.0  
Unrealized Losses Less Than 12 Months $ 0.4  
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security 22  
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer $ 3.4  
Unrealized Losses 12 Months Or Longer $ 0.1  
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security 6  
Certificates of Deposit    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities   $ 0.5
Number of Marketable Debt Securities in a Loss Position | Security   1
Unrealized Losses   $ 0.0
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months $ 0.8  
Unrealized Losses Less Than 12 Months $ 0.0  
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security 2  
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer $ 0.0  
Unrealized Losses 12 Months Or Longer $ 0.0  
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security 0  
Corporate Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities   $ 106.9
Number of Marketable Debt Securities in a Loss Position | Security   153
Unrealized Losses [1]   $ 0.3
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months $ 103.1  
Unrealized Losses Less Than 12 Months $ 2.1  
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security 165  
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer $ 9.2  
Unrealized Losses 12 Months Or Longer $ 0.5  
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security 10  
U.S. Government Agency Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities   $ 4.8
Number of Marketable Debt Securities in a Loss Position | Security   6
Unrealized Losses  
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months $ 2.9  
Unrealized Losses Less Than 12 Months $ 0.1  
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security 5  
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer $ 0.3  
Unrealized Losses 12 Months Or Longer $ 0.0  
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security 1  
[1] For the period ended December 31, 2021, there were no debt securities in a continuous loss position greater than or equal to 12 months.