Related Party Transactions - Schedule of Related Party Revenue and Cost of Revenue (Details) - The entity whose independent board member serves the company's board of directors - Alliance Agreement - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related party transactions
Related party revenue	$ 2,008	$ 3,314	$ 5,594
Related party cost of revenue	$ 131