Goodwill - Sensitivity to changes in assumptions (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] | |||
| Impairment | $ (1,747,000) | $ (15,483,000) | |
| U.S. Silicon Metal | |||
| Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] | |||
| Impairment | (1,747,000) | $ (15,483,000) | $ 0 |
| U.S. Silicon Based Alloys | |||
| Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] | |||
| Excess of recoverable value over carrying value | $ 7,144,000 | ||