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Goodwill and Intangible Assets, Net - Finite-Lived Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross | $ 61,105 |  |  | $ 61,105 |  | $ 55,170
Accumulated Amortization | (30,946) |  |  | (30,946) |  | (26,621)
Net | 30,159 |  |  | 30,159 |  | 28,549
Finite-lived intangible assets, fully amortized, gross | 6,000 |  |  | 6,000 |  | 10,200
Amortization expense | 1,769 |  | $ 1,572 | 5,160 | $ 4,681 |
Cost of sales |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Amortization expense | 54 |  | 21 | 128 | 63 |
Selling, general and administrative expenses |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Amortization expense | 1,715 |  | $ 1,551 | 5,032 | $ 4,618 |
Distribution rights |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross | 340 |  |  | 340 |  | 302
Accumulated Amortization | (155) |  |  | (155) |  | (119)
Net | 185 |  |  | 185 |  | 183
Patents |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross | 12,593 |  |  | 12,593 |  | 12,038
Accumulated Amortization | (4,996) |  |  | (4,996) |  | (4,775)
Net | 7,597 |  |  | 7,597 |  | 7,263
Trademarks and trade names (2) |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross | 2,786 |  |  | 2,786 |  | 2,400
Accumulated Amortization | (1,518) |  |  | (1,518) |  | (1,310)
Net | 1,268 |  |  | 1,268 |  | 1,090
Developed and core technology |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross | 12,560 |  |  | 12,560 |  | 12,585
Accumulated Amortization | (5,567) |  |  | (5,567) |  | (4,068)
Net | 6,993 |  |  | 6,993 |  | 8,517
Capitalized software development costs |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross | 142 |  |  | 142 |  | 142
Accumulated Amortization | (59) |  |  | (59) |  | (5)
Net | 83 |  |  | 83 |  | 137
Customer relationships (2) |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross | 32,534 |  |  | 32,534 |  | 27,703
Accumulated Amortization | (18,613) |  |  | (18,613) |  | (16,344)
Net | 13,921 |  |  | 13,921 |  | 11,359
Order backlog (2) |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross | 150 |  |  | 150 |  | 0
Accumulated Amortization | (38) |  |  | (38) |  | 0
Net | 112 |  |  | 112 |  | $ 0
Residential Control Systems, Inc | Customer relationships (2) |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Finite-lived intangible assets | 5,000 | $ 5,000 |  | 5,000 |  |
Estimated lives, finite-lived intangible asset |  | 10 years |  |  |  |
Residential Control Systems, Inc | Order backlog (2) |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Finite-lived intangible assets | 150 | $ 200 |  | 150 |  |
Estimated lives, finite-lived intangible asset |  | 1 year |  |  |  |
Residential Control Systems, Inc | Trade name |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Finite-lived intangible assets | $ 400 | $ 400 |  | $ 400 |  |
Estimated lives, finite-lived intangible asset |  | 8 years |  |  |  |

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