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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventories    
Raw materials $ 21,986 $ 20,677
Work in process 25,261 24,946
Finished goods 2,339 3,529
Inventories, Total 49,586 49,152
Inventory reserve 16,600 16,400
Excess and obsolete inventory $ 121,000 $ 91