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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)