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Acquisition (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Feb. 28, 2018
May 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
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      
WattMaster | Revision            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]            
Accounts receivable     9      
Inventories     (62)      
Property, plant and equipment     207      
Intellectual property     700      
Goodwill     (448)      
Assumed current liabilities     (29)      
Consideration paid     $ 377      
WattMaster | As Reported            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]            
Accounts receivable         $ 1,073  
Inventories         1,442  
Property, plant and equipment         133  
Intellectual property         0  
Goodwill         3,677  
Assumed current liabilities         (325)  
Consideration paid         $ 6,000