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Acquisition (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Feb. 28, 2018
May 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]          
Payments to acquire businesses     $ 6,377 $ 0  
Working capital settlement paid   $ 400      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Goodwill     3,229   $ 0
WattMaster          
Business Acquisition [Line Items]          
Payments to acquire businesses $ 6,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Accounts receivable     1,082    
Inventories     1,380    
Property, plant and equipment     340    
Intellectual property     700    
Goodwill     3,229    
Assumed current liabilities     (354)    
Consideration paid     $ 6,377