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Business Combination (Details) - USD ($)
$ in Thousands
1 Months Ended
Feb. 28, 2018
May 31, 2018
Mar. 01, 2018
Business Acquisition [Line Items]      
Working capital settlement paid   $ 400  
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