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Investments in Privately-Held Companies - Minority Investment Entities (Details) - Five Minority Investments - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |
Net revenue | $ 3,713,000 | $ 8,017,000 | $ 14,713,000 | $ 24,366,000
Gross profit (loss) | 309,000 | 2,141,000 | 1,423,000 | 5,477,000
Operating (loss) | (436,000) | 631,000 | (1,857,000) | 767,000
Net (loss) | (502,000) | 315,000 | (2,518,000) | (422,000)
Minority investment entities |  |  |  |
Entity (loss) excluding impairment | $ (200,000) | $ 6,000 | $ (1,800,000) | $ (21,000)

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