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Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Useful Life (Years) |  | 11 years 8 months |
Assets Impaired | $ 8,500 | $ 8,500 |
Accumulated Amortization | 1,326 | 1,326 |
Net Book Value at September 30, 2019 | 9,244 | 9,244 |
Gross Carrying Amount at December 31, 2018 |  |  | $ 19,070
Net Book Value at September 30, 2019 | 9,244 | $ 9,244 | 18,068
Developed technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Useful Life (Years) |  | 13 years |
Gross Carrying Amount at December 31, 2018 |  |  | 18,800
Assets Impaired |  | $ 8,500 |
Accumulated Amortization | 1,056 | 1,056 |
Net Book Value at September 30, 2019 | 9,244 | $ 9,244 |
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Useful Life (Years) |  | 1 year |
Gross Carrying Amount at December 31, 2018 |  |  | $ 270
Assets Impaired |  | $ 0 |
Accumulated Amortization | 270 | 270 |
Net Book Value at September 30, 2019 | $ 0 | $ 0 |

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