Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock-based compensation expense included in the above:
Stock-based compensation expense	$ 2,851	$ 1,130	$ 8,406	$ 3,104
Cost of Revenue [Member]
Stock-based compensation expense included in the above:
Stock-based compensation expense	533	213	1,506	552
Sales and Marketing [Member]
Stock-based compensation expense included in the above:
Stock-based compensation expense	950	415	3,085	1,117
Research and Development [Member]
Stock-based compensation expense included in the above:
Stock-based compensation expense	835	276	2,309	731
General and Administrative [Member]
Stock-based compensation expense included in the above:
Stock-based compensation expense	$ 533	$ 226	$ 1,506	$ 704