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Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred income tax assets:    
Deferred revenue $ 143.0 $ 10.0
Capitalized research and development 56.3 0.0
Stock compensation 25.9 15.4
Tax credits 10.4 18.8
Loss carryforwards 3.8 97.0
Other 7.7 3.3
Total deferred income tax assets 247.1 144.5
Deferred income tax liabilities:    
Property, equipment and leasehold improvements (2.6) (3.6)
Other (1.0) (1.4)
Total deferred income tax liabilities (3.6) (5.0)
Less valuation allowance (243.5) (139.5)
Net deferred income tax liability $ 0.0 $ 0.0