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Goodwill and Intangible Assets, Net - Finite-Lived Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 04, 2015
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Gross |  | $ 61,766 | $ 55,170 |  |
Accumulated Amortization |  | (32,725) | (26,621) |  |
Intangible assets, net |  | 29,041 | 28,549 |  |
Finite-lived intangible assets, fully amortized, gross |  | $ 6,000 | 10,200 |  |
Intangible assets acquired, weighted average amortization period |  | 6 years 9 months 18 days |  |  |
Amortization expense |  | $ 6,956 | 6,274 | $ 4,842 |
Cost of sales |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Amortization expense |  | 184 | 76 | 123 |
Selling, general and administrative expenses |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Amortization expense |  | 6,772 | 6,198 | $ 4,719 |
Distribution rights |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Gross |  | 344 | 302 |  |
Accumulated Amortization |  | (165) | (119) |  |
Intangible assets, net |  | $ 179 | 183 |  |
Intangible asset, estimated useful life |  | 10 years |  |  |
Patents |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Gross |  | $ 13,250 | 12,038 |  |
Accumulated Amortization |  | (5,310) | (4,775) |  |
Intangible assets, net |  | $ 7,940 | 7,263 |  |
Intangible asset, estimated useful life |  | 10 years |  |  |
Trademark and trade names |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Gross |  | $ 2,786 | 2,400 |  |
Accumulated Amortization |  | (1,594) | (1,310) |  |
Intangible assets, net |  | $ 1,192 | 1,090 |  |
Intangible asset, estimated useful life |  | 10 years |  |  |
Developed and core technology |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Gross |  | $ 12,560 | 12,585 |  |
Accumulated Amortization |  | (6,071) | (4,068) |  |
Intangible assets, net |  | 6,489 | 8,517 |  |
Developed and core technology | Ecolink Intelligent Technology, Inc. |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible assets acquired |  |  |  |  | $ 9,080
Capitalized software development costs |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Gross |  | 142 | 142 |  |
Accumulated Amortization |  | (77) | (5) |  |
Intangible assets, net |  | $ 65 | 137 |  |
Intangible asset, estimated useful life |  | 2 years |  |  |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Gross |  | $ 32,534 | 27,703 |  |
Accumulated Amortization |  | (19,395) | (16,344) |  |
Intangible assets, net |  | $ 13,139 | 11,359 |  |
Customer relationships | Ecolink Intelligent Technology, Inc. |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible assets acquired | $ 5,000 |  |  |  | 1,300
Intangible assets acquired, weighted average amortization period | 10 years |  |  |  |
Intangible asset, estimated useful life |  | 5 years |  |  |
Order backlog |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Gross |  | $ 150 | 0 |  |
Accumulated Amortization |  | (113) | 0 |  |
Intangible assets, net |  | $ 37 | $ 0 |  |
Intangible asset, estimated useful life |  | 1 year |  |  |
Order backlog | Ecolink Intelligent Technology, Inc. |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible assets acquired | $ 200 |  |  |  |
Intangible assets acquired, weighted average amortization period | 1 year |  |  |  |
Trade name | Ecolink Intelligent Technology, Inc. |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible assets acquired | $ 400 |  |  |  | $ 400
Intangible assets acquired, weighted average amortization period | 8 years |  |  |  |
Intangible asset, estimated useful life |  | 7 years |  |  |
Minimum |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible asset, estimated useful life |  | 1 year |  |  |
Minimum | Developed and core technology |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible asset, estimated useful life |  | 5 years |  |  |
Minimum | Developed and core technology | Ecolink Intelligent Technology, Inc. |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible asset, estimated useful life |  | 4 years |  |  |
Minimum | Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible asset, estimated useful life |  | 10 years |  |  |
Maximum |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible asset, estimated useful life |  | 15 years |  |  |
Maximum | Developed and core technology |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible asset, estimated useful life |  | 15 years |  |  |
Maximum | Developed and core technology | Ecolink Intelligent Technology, Inc. |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible asset, estimated useful life |  | 14 years |  |  |
Maximum | Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Intangible asset, estimated useful life |  | 15 years |  |  |

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