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Business Combination - Additional Disclosures (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Apr. 06, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Business Combination            
Cash consideration         $ 8,894,000 $ 0
Residential Control Systems, Inc            
Business Combination            
Initial purchase price $ 12,600,000          
Cash consideration 8,900,000       8,894,000  
Contingent consideration 3,700,000          
Acquisition costs         100,000  
Net sales   $ 800,000   $ 2,200,000    
Net loss   $ 300,000   $ 700,000    
Potential additional earnout payments $ 10,000,000.0          
Pro forma information, increase (decrease) in amortization expense, net     $ 200,000   $ 100,000 $ 500,000
Residential Control Systems, Inc | Valuation methodology based on projections of future operating income            
Business Combination            
Contingent consideration discount rate 24.80%