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Business Combinations Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 06, 2017 | Aug. 04, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 48,651 | $ 43,052 | $ 43,116 |
Cash paid |  |  | $ 8,894 | $ 0 | $ 0 |
Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset, estimated useful life |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset, estimated useful life |  |  | 15 years |  |  |
Developed technology | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset, estimated useful life |  |  | 5 years |  |  |
Developed technology | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset, estimated useful life |  |  | 15 years |  |  |
Customer relationships | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset, estimated useful life |  |  | 10 years |  |  |
Customer relationships | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset, estimated useful life |  |  | 15 years |  |  |
Order backlog |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset, estimated useful life |  |  | 1 year |  |  |
Ecolink Intelligent Technology, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | $ 685 |  |  |  |
Accounts receivable |  | 374 |  |  |  |
Inventories |  | 1,412 |  |  |  |
Prepaid expenses and other current assets |  | 253 |  |  |  |
Property, plant and equipment |  | 16 |  |  |  |
Non-interest bearing liabilities |  | (1,557) |  |  |  |
Net tangible assets acquired |  | 1,183 |  |  |  |
Goodwill | $ 5,494 | 12,564 |  |  |  |
Total purchase price |  | 24,527 |  |  |  |
Noncontrolling interest in Encore |  | (378) |  |  |  |
Net purchase price |  | 24,149 |  |  |  |
Less: Contingent consideration |  | (11,200) |  |  |  |
Cash paid |  | 12,949 |  |  |  |
Ecolink Intelligent Technology, Inc. | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 1 year |  |  |
Ecolink Intelligent Technology, Inc. | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 4 years |  |  |
Ecolink Intelligent Technology, Inc. | Trade name |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  | 400 |  |  |  | $ 400
Intangible asset, estimated useful life |  |  | 7 years |  |  |
Ecolink Intelligent Technology, Inc. | Developed technology |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  | 9,080 |  |  |  |
Ecolink Intelligent Technology, Inc. | Developed technology | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset, estimated useful life |  |  | 4 years |  |  |
Ecolink Intelligent Technology, Inc. | Developed technology | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible asset, estimated useful life |  |  | 14 years |  |  |
Ecolink Intelligent Technology, Inc. | Customer relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  | $ 1,300 |  |  |  | 5,000
Intangible asset, estimated useful life |  |  | 5 years |  |  |
Ecolink Intelligent Technology, Inc. | Order backlog |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 200
Residential Control Systems, Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
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 |  |  |
Total purchase price | 12,594 |  |  |  |  |
Less: Contingent consideration | (3,700) |  |  |  |  |
Cash paid | 8,894 |  |  |  |  |
Residential Control Systems, Inc | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 1 year |  |  |
Residential Control Systems, Inc | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 4 years |  |  |
Residential Control Systems, Inc | Trade name |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets | 400 |  |  |  |  |
Intangible asset, estimated useful life |  |  | 8 years |  |  |
Residential Control Systems, Inc | Customer relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets | 5,000 |  |  |  |  |
Intangible asset, estimated useful life |  |  | 10 years |  |  |
Residential Control Systems, Inc | Order backlog |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets | $ 150 |  |  |  |  |
Intangible asset, estimated useful life |  |  | 1 year |  |  |

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