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Income Taxes - Components of Company's Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Net operating loss carryforwards $ 91.4 $ 143.5
Tax credits 54.1 33.6
Capitalized research and development expenditures 53.3 30.4
Warranty 2.2 14.6
Accrued expenses 22.9 10.2
Amortization of debt discount 7.8 11.0
Inventory capitalization 6.5 4.1
Intangible assets 8.0 12.9
Interest limitation carryforwards 0.0 1.7
Incentive compensation 13.5 9.4
Stock-based compensation 8.0 6.4
Other 5.4 4.5
Total deferred tax assets 273.1 282.3
Deferred tax liabilities:    
Prepaid assets (7.7) (5.3)
Property, plant and equipment (38.1) (31.5)
Capitalized contract acquisition costs (10.4) (10.4)
Unrealized gains on cash flow hedges (5.1) (8.8)
Other (7.7) (1.9)
Total deferred tax liabilities (69.0) (57.9)
Net deferred tax asset before valuation allowance 204.1 224.4
Valuation allowance (202.9) (222.8)
Net deferred tax asset $ 1.2 $ 1.6