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Business Combination - Narrative (Details) |  | 3 Months Ended | 6 Months Ended |
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Apr. 06, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Business Combination |  |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 0 | $ 8,854,000 |
Fair value of earnout consideration |  | $ 9,730,000 |  |  | 9,730,000 |  | $ 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 |  | 800,000 |  | $ 1,400,000 | 1,900,000 | 1,400,000 |
Net loss |  | 600,000 | $ 400,000 |  | 900,000 |  |
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 |  | $ 2,400,000 |  |  | $ 2,400,000 |  |
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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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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