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Acquisitions (Summary of Consideration Paid) (Details) - USD ($)
$ in Thousands
Aug. 01, 2015
Jan. 16, 2015
Mar. 31, 2016
Dec. 31, 2015
Purchase Price Allocation        
Goodwill     $ 10,068 $ 10,068
Harmonics Holdings Incorporated [Member]        
Purchase Price        
Cash consideration   $ 93    
Forgiveness of trade payables and indebtness due to purchaser   609    
Deferred payments due to seller   341    
[us-gaap:BusinessCombinationConsiderationTransferred1]   1,043    
Purchase Price Allocation        
Current assets   21    
Property, plant and equipment   4    
Identifiable intangible assets   995    
Goodwill   23    
Net assets acquired   $ 1,043    
Pacific Power Systems Integration Incorporated [Member]        
Purchase Price        
Cash consideration $ 2,013      
[us-gaap:BusinessCombinationConsiderationTransferred1] 2,013      
Purchase Price Allocation        
Current assets 18      
Property, plant and equipment 147      
Identifiable intangible assets 1,500      
Goodwill 348      
Net assets acquired $ 2,013