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Inventories (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 831,000 $ 1,009,000
Work in process 934,000 816,000
Finished goods 2,181,000 2,473,000
Inventory, net $ 3,946,000 $ 4,298,000