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	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Related party transactions
Related party revenue	$ 359	$ 383	$ 1,646
Related party cost of revenue	$ 2	$ 1	$ 129