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Inventory (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Inventory [Line Items]    
Inventory, Raw Materials and Purchased Parts, Net of Reserves $ 13,984,000 $ 8,450,000
Inventory, Work in Process, Net of Reserves 1,235,000 2,061,000
Inventory, Finished Goods, Net of Reserves 4,464,000 2,948,000
Inventory, Net $ 19,683,000 $ 13,459,000