CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	$ 1,922	$ 436	$ 3,694	$ 822
Cost of revenue
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	29		57
Sales and marketing
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	41		56
Research and development
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	298		660
General and administrative
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	$ 1,554	$ 436	$ 2,921	$ 822