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Investments in Privately-Held Companies - Minority Investment Entities (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) company | Mar. 31, 2018 USD ($) company | Dec. 31, 2018 company
Minority investment entities |  |  |
Minority investments not consolidated accounted for under equity method | company | 5 | 5 | 7
Five Minority Investments |  |  |
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |
Net revenue | $ 6,441 | $ 7,356 |
Gross profit (loss) | (51) | 586 |
Operating (loss) | (2,039) | (1,735) |
Net (loss) | (2,446) | (1,430) |
Minority investment entities |  |  |
Entity (loss) excluding impairment | $ (1,600) | $ (300) |

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