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Business Combination - Schedule of Purchase Price Allocation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 06, 2017
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Business Combination          
Goodwill     $ 48,624   $ 43,052
Cash paid     8,894 $ 0  
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   $ 5,500 5,494    
Total purchase price     12,594    
Less: Contingent consideration     (3,700)    
Cash paid $ 8,900   8,894    
Residential Control Systems, Inc | Trade name          
Business Combination          
Finite-lived intangible assets   $ 400 400    
Estimated lives, finite-lived intangible asset   8 years      
Residential Control Systems, Inc | Customer relationships          
Business Combination          
Finite-lived intangible assets   $ 5,000 5,000    
Estimated lives, finite-lived intangible asset   10 years      
Residential Control Systems, Inc | Order backlog          
Business Combination          
Finite-lived intangible assets   $ 200 $ 150    
Estimated lives, finite-lived intangible asset   1 year      
Residential Control Systems, Inc | Minimum          
Business Combination          
Estimated lives, Property, plant and equipment     1 year    
Residential Control Systems, Inc | Minimum | Order backlog          
Business Combination          
Estimated lives, finite-lived intangible asset     1 year    
Residential Control Systems, Inc | Maximum          
Business Combination          
Estimated lives, Property, plant and equipment     4 years    
Residential Control Systems, Inc | Maximum | Trade name          
Business Combination          
Estimated lives, finite-lived intangible asset     8 years    
Residential Control Systems, Inc | Maximum | Customer relationships          
Business Combination          
Estimated lives, finite-lived intangible asset     10 years