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Business Combination - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
6 Months Ended
Apr. 06, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Combination        
Goodwill   $ 48,522   $ 48,651
Cash paid   $ 0 $ 8,854  
Residential Control Systems, Inc        
Business Combination        
Accounts receivable $ 429      
Inventories 1,508      
Prepaid expenses and other current assets 7      
Property, plant and equipment 14      
Current liabilities (408)      
Net tangible assets acquired 1,550      
Goodwill 5,494      
Total purchase price 12,594      
Less: Contingent consideration (3,700)      
Cash paid 8,894      
Residential Control Systems, Inc | Minimum        
Business Combination        
Estimated lives of property, plant and equipment   1 year    
Residential Control Systems, Inc | Maximum        
Business Combination        
Estimated lives of property, plant and equipment   4 years    
Residential Control Systems, Inc | Trade name        
Business Combination        
Finite-lived intangible assets 400      
Estimated useful life of intangible assets   8 years    
Residential Control Systems, Inc | Customer relationships        
Business Combination        
Finite-lived intangible assets 5,000      
Estimated useful life of intangible assets   10 years    
Residential Control Systems, Inc | Order backlog        
Business Combination        
Finite-lived intangible assets $ 150      
Estimated useful life of intangible assets   1 year