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Business Combination - Narrative (Details) - USD ($) $ in Thousands | Aug. 29, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 900 | $ 317
Nevis Networks |  |  |
Business Acquisition [Line Items] |  |  |
Total purchase price | $ 5,800 |  |
Technology-based intangible assets | 5,200 |  |
Goodwill | $ 600 |  |
Estimated useful life of technology-based intangible assets | 5 years |  |

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