Balance Sheet Components - Other Assets (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Apr. 30, 2016	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Balance Sheet Components
Agreement term	4 years
Total consideration	$ 3.2
Deferred costs included in other long-term assets		$ 2.2	$ 2.2	$ 2.6
Amortization of deferred costs		$ 0.2	$ 0.4