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Business Combination - Narrative (Details) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 06, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Business Combination |  |  |  |
Fair value of earnout consideration |  | $ 9,360,000 |  | $ 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 |  | 1,100,000 |  |
Net loss |  | 300,000 |  |
Additional earnout payments | $ 10,000,000 |  |  |
Net increase in amortization expense |  |  | $ 100,000 |
Fair value of earnout consideration |  | 2,300,000 |  |
Residential Control Systems, Inc | Other Accrued Liabilities |  |  |  |
Business Combination |  |  |  |
Fair value of earnout consideration |  | 21,000 |  |
Residential Control Systems, Inc | Long-term Contingent Consideration |  |  |  |
Business Combination |  |  |  |
Fair value of earnout consideration |  | $ 2,200,000 |  |
Residential Control Systems, Inc | Valuation Methodology Based on Future Operating Income Projections |  |  |  |
Business Combination |  |  |  |
Discount rate | 24.80% |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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