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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets:    
Accruals and reserves $ 2.0 $ 1.6
Tax credits 12.7 12.1
Stock-based compensation 3.4 3.9
Capitalized research and development expenses 30.4 55.5
Net operating loss carryforwards 5.5 3.2
Lease liabilities 2.0 1.6
Other 0.4 0.4
Total gross deferred tax assets 56.4 78.3
Deferred tax liabilities:    
Prepaid expenses and other (0.5) (0.4)
ROU assets (1.8) (1.3)
Basis difference for fixed assets and intangibles (10.3) (17.1)
Total gross deferred tax liabilities (12.6) (18.8)
Valuation allowance for deferred tax assets (14.4) (14.1)
Net deferred tax asset $ 29.4 $ 45.4