Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total stock-based compensation	$ 3,251	$ 3,527	$ 3,051
Cost of goods sold — direct
Total stock-based compensation	154	272	193
Sales and marketing
Total stock-based compensation	167	318	377
Technology
Total stock-based compensation	352	799	628
General and administrative
Total stock-based compensation	$ 2,578	$ 2,138	$ 1,853