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Business Combination - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 06, 2017
Mar. 31, 2018
Dec. 31, 2017
Business Combination      
Goodwill   $ 48,620 $ 48,651
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