CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based compensation expense	$ 19,213	$ 17,695
Cost of revenue
Share-based compensation expense	2,104	1,633
Research and development
Share-based compensation expense	6,914	6,627
Sales and marketing
Share-based compensation expense	5,633	5,439
General and administrative
Share-based compensation expense	$ 4,562	$ 3,996