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Investments in Privately Held Companies - Minority Investment Entities (Details) | 3 Months Ended
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Mar. 31, 2018 USD ($) company | Mar. 31, 2017 USD ($)
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |
Net loss | $ (334,000) | $ (933,000)
Minority investment entities |  |
Minority investments not consolidated accounted for under equity method | company | 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 | $ 7,356,000 | 5,455,000
Gross profit | 35,000 | 3,722,000
Operating loss | (1,163,000) | (837,000)
Net loss | $ (1,430,000) | $ (1,705,000)
Minority investment entities |  |
Minority investments not consolidated accounted for under equity method | company | 7 |

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