CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based compensation expense			$ 62,805	$ 56,337
Cost of revenue
Share-based compensation expense	$ 2,408	$ 1,919	6,668	5,355
Research and development
Share-based compensation expense	7,776	7,172	22,273	20,548
Sales and marketing
Share-based compensation expense	6,716	6,657	18,362	17,780
General and administrative
Share-based compensation expense	$ 5,619	$ 4,247	$ 15,502	$ 12,654