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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventories    
Raw materials $ 23,078 $ 20,677
Work in process 23,166 24,946
Finished goods 2,113 3,529
Inventories, Total 48,357 49,152
Inventory reserve 16,900 16,400
Excess and obsolete inventory $ 86,000 $ 91,000