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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details)
$ in Millions
Mar. 31, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities $ 142.8 $ 134.6
Number of Marketable Debt Securities in a Loss Position | Security 194 187
Unrealized Losses $ 2.0 $ 0.4
Corporate Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities [1] $ 113.7 $ 106.9
Number of Marketable Debt Securities in a Loss Position | Security [1] 160 153
Unrealized Losses [1] $ 1.6 $ 0.3
U.S. Government Agency Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities $ 5.5 $ 4.8
Number of Marketable Debt Securities in a Loss Position | Security 7 6
Unrealized Losses $ 0.3 $ 0.0
U.S. Treasury Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities $ 22.6 $ 22.4
Number of Marketable Debt Securities in a Loss Position | Security 25 27
Unrealized Losses $ 0.1 $ 0.1
Certificates of Deposit    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value of Marketable Debt Securities $ 1.0 $ 0.5
Number of Marketable Debt Securities in a Loss Position | Security 2 1
Unrealized Losses $ 0.0 $ 0.0
[1] ncludes one marketable debt security in a continuous loss position greater than 12 months with a fair value of $0.3 million and an insignificant amount of unrealized loss.