CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	$ 7,415	$ 2,894	$ 1,842
Cost of revenue
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	164
Sales and marketing
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	173
Research and development
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	1,212
General and administrative
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	$ 5,866	$ 2,894	$ 1,842