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Investments in Privately-Held Companies - Minority Investment Entities (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) company | Sep. 30, 2017 USD ($) company | Sep. 30, 2018 USD ($) company | Sep. 30, 2017 USD ($) company
Minority investment entities |  |  |  |
Minority investments not consolidated accounted for under equity method | company | 7 | 7 | 7 | 7
Seven 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 | $ 8,017,000 | $ 4,209,000 | $ 24,366,000 | $ 15,571,000
Gross profit | 2,141,000 | 177,000 | 5,477,000 | 976,000
Operating income (loss) | 631,000 | (1,054,000) | 767,000 | (2,685,000)
Net income (loss) | 315,000 | (1,130,000) | (422,000) | (3,653,000)
Minority investment entities |  |  |  |
Entity income (loss) excluding impairment | $ 6,000 | $ (266,000) | $ (21,000) | $ (1,400,000)

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