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Investments in Privately Held Companies - Minority Investment Entities (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) company | Jun. 30, 2017 USD ($) company | Jun. 30, 2018 USD ($) company | Jun. 30, 2017 USD ($) 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 | $ 8,993,000 | $ 5,908,000 | $ 16,349,000 | $ 11,363,000
Gross profit | 1,702,000 | 4,277,000 | 1,737,000 | 7,999,000
Operating income (loss) | 1,871,000 | (794,000) | 708,000 | (1,631,000)
Net income (loss) | 694,000 | (818,000) | (737,000) | (2,523,000)
Minority investment entities |  |  |  |
Entity income (loss) excluding impairment | $ 307,000 | $ (188,000) | $ (27,000) | $ (1,100,000)

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