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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