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Income taxes - Net Deferred Tax Asset (Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets    
Federal losses carryforward $ 58.7 $ 14.8
State losses carryforward 38.9 13.0
R&D carryforward 21.9 18.4
Stock compensation 6.8 10.4
Foreign losses carryforward 13.9 9.1
Deferred revenue 0.0 2.0
Inventory reserves 12.6 10.9
Lease liability 4.3 4.7
IRC 263A capitalized costs 2.8 5.2
Capitalized R&D 35.3 27.3
IRC 163(j) Interest Limitation 26.2 7.9
Fixed assets 26.7 0.1
Intangible assets 13.8 0.0
Accrued compensation 2.8 0.5
Other 4.8 6.5
Gross deferred tax assets 269.5 130.8
Valuation allowance (257.8) (65.1)
Total deferred tax assets 11.7 65.7
Deferred tax liabilities    
Fixed assets (2.6) (63.7)
Intangible assets (40.4) (46.1)
Right-of-use asset (4.0) (4.5)
Foreign Withholding Tax (5.5) (4.7)
Prepaid expenses (4.2) (3.9)
Other (2.2) (2.5)
Total deferred tax liabilities (58.9) (125.4)
Net deferred tax liabilities $ (47.2) $ (59.7)