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Business Combination - Narrative (Details)		3 Months Ended		6 Months Ended	9 Months Ended
	Apr. 06, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Business Combination
Cash consideration					$ 0	$ 8,894,000
Fair value of earnout consideration		$ 10,170,000			10,170,000		$ 13,400,000
Residential Control Systems, Inc
Business Combination
Initial purchase price	$ 12,600,000
Cash consideration	8,894,000
Contingent consideration	3,700,000
Net sales		1,400,000	$ 800,000	$ 2,200,000	3,300,000
Net loss		400,000	$ 300,000	$ 700,000	1,300,000
Additional earnout payments	$ 10,000,000
Net increase in amortization expense						100,000
Acquisition costs excluded from pro forma net income						$ 100,000
Residential Control Systems, Inc | Long-term Contingent Consideration
Business Combination
Fair value of earnout consideration		$ 2,600,000			$ 2,600,000
Measurement Input, Discount Rate [Member] | Residential Control Systems, Inc | Valuation Methodology Based on Future Operating Income Projections
Business Combination
Discount rate	0.248

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