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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventories    
Raw materials $ 20,974 $ 20,677
Work in process 24,874 24,946
Finished goods 2,405 3,529
Inventories, Total 48,253 49,152
Inventory reserve 16,600 16,400
Excess and obsolete inventory $ 97 $ 91