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Business Combinations - Additional Disclosures (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 06, 2017 | Apr. 21, 2016 | Aug. 04, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration |  |  |  | $ 8,894 | $ 0 | $ 0
Long-term contingent consideration |  |  |  | 13,400 | 10,500 |
Ecolink Intelligent Technology, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  |  | $ 24,100 |  |  |
Cash consideration |  |  | 12,949 |  |  |
Contingent consideration |  |  | 11,200 |  |  |
Acquisition costs |  |  | 200 |  |  |
Fair value of noncontrolling interest |  |  | $ 378 |  |  |
Net sales since acquisition date |  |  |  | 33,000 | 4,800 | 1,300
Net loss since acquisition date |  |  |  | 700 | 1,600 | 1,000
Period of recognition for earnout payments to acquiree (in years) |  |  | 5 years |  |  |
Long-term contingent consideration |  |  |  | 14,900 | 10,500 | $ 11,800
Increase (decrease) in earnout contingent consideration |  |  |  | 4,400 | (1,300) |
Ecolink Intelligent Technology, Inc. | Other Nonoperating Income (Expense) |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Deconsolidation gain |  | $ 65 |  |  |  |
Ecolink Intelligent Technology, Inc. | Income Approach Valuation Technique |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value inputs, discount rate |  |  | 15.50% |  |  |
Ecolink Intelligent Technology, Inc. | Encore Controls LLC | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired ownership interest of Acquiree's subsidiary (percentage) |  |  | 50.00% |  |  |
Aggregated fair value of net assets acquired |  |  | $ 700 |  |  |
Fair value of noncontrolling interest |  |  | $ 400 |  |  |
Residential Control Systems, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 12,600 |  |  |  |  |
Cash consideration | 8,894 |  |  |  |  |
Contingent consideration | 3,700 |  |  |  |  |
Acquisition costs | 200 |  |  | 100 |  |
Net sales since acquisition date |  |  |  | 3,500 |  |
Net loss since acquisition date |  |  |  | 400 |  |
Additional earnout payments | 10,000 |  |  |  |  |
Contingent consideration | $ 3,700 |  |  |  |  |
Pro forma information, increase (decrease) in amortization expense, net |  |  |  | 100 | $ 700 |
Residential Control Systems, Inc | Income Approach Valuation Technique |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value inputs, discount rate | 24.80% |  |  |  |  |
Other Accrued Liabilities | Ecolink Intelligent Technology, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term contingent consideration |  |  |  | 3,800 |  |
Long-term Contingent Consideration | Ecolink Intelligent Technology, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term contingent consideration |  |  |  | 11,100 |  |
Long-term Contingent Consideration | Residential Control Systems, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term contingent consideration |  |  |  | $ 2,300 |  |

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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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- 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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- Definition This element represents the amount of any change recognized during the period in the high-end of the estimated range of outcomes (undiscounted) of a liability assumed in a business combination arising from an item of contingent consideration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4582445-111684 + Details
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