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Equity method investment - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Feb. 09, 2023
Schedule of Equity Method Investments [Line Items]
Placing Purchase Orders			Pursuant to the Supply Agreement, we committed to placing a minimum level of purchase orders for torque tubes with Alpha Steel during the period from July 1, 2025 to June 30, 2026 and for the subsequent annual period.
Net Profit Attributable			$ 4.0
Taihua New Energy [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage					51.00%
DAYV LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage					4.00%
Alpha Steel
Schedule of Equity Method Investments [Line Items]
Ownership percentage					45.00%
Potential future capital contributions	$ 0.8		0.8
Loss from unconsolidated subsidiary	$ 0.5	$ 0.2	$ 0.6	$ 0.5

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