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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Inventories    
Raw materials $ 38,463 $ 29,658
Work in process 35,976 32,605
Finished goods 2,841 3,649
Inventories, Total 77,280 65,912
Inventory reserve 22,100 19,600
Excess and obsolete inventory $ 135 $ 66