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Business Combination (Details) - USD ($)
$ in Thousands
1 Months Ended
Feb. 28, 2018
May 31, 2018
Dec. 31, 2018
Mar. 01, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
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