CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based compensation expense			$ 40,287	$ 36,341
Cost of revenue
Share-based compensation expense	$ 2,156	$ 1,802	4,260	3,435
Research and development
Share-based compensation expense	7,584	6,749	14,497	13,376
Sales and marketing
Share-based compensation expense	6,013	5,684	11,646	11,123
General and administrative
Share-based compensation expense	$ 5,321	$ 4,410	$ 9,884	$ 8,407