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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventories    
Raw materials $ 19,546 $ 19,532
Work in process 16,611 16,007
Finished goods 2,665 2,473
Inventories, total 38,822 38,012
Inventory reserve $ 12,700 $ 12,000