CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based compensation expense	$ 73,779	$ 52,556	$ 32,139
Cost of Revenue
Share-based compensation expense	7,045	4,541	2,464
Research and Development
Share-based compensation expense	27,083	19,414	10,918
Sales and Marketing
Share-based compensation expense	23,043	14,759	10,680
General and Administrative
Share-based compensation expense	$ 16,608	$ 13,842	$ 8,077