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Investments in Privately-Held Companies - Minority Investment Entities (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) company	Mar. 31, 2018 USD ($) company	Dec. 31, 2018 company
Minority investment entities
Minority investments not consolidated accounted for under equity method | company	5	5	7
Five 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	$ 6,441	$ 7,356
Gross profit (loss)	(51)	586
Operating (loss)	(2,039)	(1,735)
Net (loss)	(2,446)	(1,430)
Minority investment entities
Entity (loss) excluding impairment	$ (1,600)	$ (300)

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The amount of net income (loss) from an equity method investment excluding impairment charges.

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