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Income taxes - Net Deferred Tax Asset (Liability) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets |  |
Federal losses carryforward | $ 14.8 | $ 7.6
State losses carryforward | 13.0 | 5.9
R&D carryforward | 18.4 | 16.6
Stock compensation | 10.4 | 9.1
Foreign losses carryforward | 9.1 | 10.2
Deferred revenue | 2.0 | 0.4
Inventory reserves | 10.9 | 3.2
Lease liability | 4.7 | 6.6
IRC 263A capitalized costs | 5.2 | 4.0
Capitalized R&D | 27.3 | 0.0
Deferred Tax Asset, Interest Carryforward | 7.9 | 0.0
Other | 1.2 | 6.0
Gross deferred tax assets | 124.9 | 69.5
Valuation allowance | (65.1) | (27.3)
Total deferred tax assets | 59.8 | 42.2
Deferred tax liabilities |  |
Fixed assets | (63.6) | (75.9)
Intangible assets | (46.1) | (47.6)
Right-of-use asset | (4.5) | (6.3)
Foreign Withholding Tax | (4.7) | 0.0
Other | (0.7) | (0.9)
Total deferred tax liabilities | (119.6) | (130.7)
Net deferred tax liabilities | $ (59.7) | $ (88.5)

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