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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 2,415 $ 2,619
Work-in-process 2,777 3,189
Finished goods 476 616
Inventory, gross 5,668 6,424
Less reserve for excess and obsolete inventories (2,125) (2,543)
Inventories, net $ 3,543 $ 3,881