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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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