Consolidated Statements of Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Total stock-based compensation	$ 968	$ 778
Cost of goods sold — direct
Total stock-based compensation	51	29
Sales and marketing
Total stock-based compensation	49	59
Technology
Total stock-based compensation	167	120
General and administrative
Total stock-based compensation	$ 701	$ 570