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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 | $ 15.3 | $ 7.6
State losses carryforward | 5.4 | 3.3
R&D carryforward | 18.4 | 16.6
Stock compensation | 10.1 | 8.9
Foreign losses carryforward | 9.1 | 10.2
Deferred revenue | 2.0 | 0.4
Inventory reserves | 10.5 | 2.9
Lease liability | 4.6 | 6.5
IRC 263A capitalized costs | 5.0 | 3.9
Capitalized R&D | 25.9 | 0.0
Deferred Tax Asset, Interest Carryforward | 7.6 | 0.0
Other | 0.7 | 5.6
Gross deferred tax assets | 114.6 | 65.9
Valuation allowance | (68.0) | (25.0)
Total deferred tax assets | 46.6 | 40.9
Deferred tax liabilities |  |
Fixed assets | (62.4) | (75.1)
Intangible assets | (46.1) | (47.6)
Right-of-use asset | (4.3) | (6.1)
Foreign Withholding Tax | (4.7) | 0.0
Other | (0.9) | (2.8)
Total deferred tax liabilities | (118.4) | (131.6)
Net deferred tax liabilities | $ (71.8) | $ (90.7)

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