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Inventories, net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Inventories, net |  |  |
Raw materials | $ 30,620 | $ 44,225 |
Work in process | 3,222 | 3,237 |
Finished goods | 5,177 | 4,183 |
Low value consumables and spare parts | 144 | 153 |
Inventories, gross | 39,163 | 51,798 |
Less: inventory write-downs | (6,298) | (6,418) |
Total inventories, net | 32,865 | 45,380 |
Change in inventory write-downs | $ (13) | $ 4,067 | $ 1,806

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