Investments in Privately Held Companies - Minority Investment Entities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]
Net revenue	$ 5,908	$ 7,245	$ 11,363	$ 10,752
Gross profit (loss)	4,277	(481)	7,999	(435)
Operating loss	(794)	(1,422)	(1,631)	(2,540)
Net loss	$ (818)	$ (1,390)	$ (2,523)	$ (3,098)