Stockholders' Equity (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Total compensation expense for stock-based employee compensation awards
Total stock-based employee compensation	$ 3,099	$ 1,624
Stock-based employee compensation expense to be recognized for equity awards granted since January 1, 2006
2013	9,091
2014	10,865
2015	7,701
2016	2,095
2017	92
Total stock-based employee compensation yet to be recognized	29,844
Cost of goods sold
Total compensation expense for stock-based employee compensation awards
Total stock-based employee compensation	554	250
Sales and marketing expenses
Total compensation expense for stock-based employee compensation awards
Total stock-based employee compensation	813	366
General and administrative expenses
Total compensation expense for stock-based employee compensation awards
Total stock-based employee compensation	1,472	915
Research and development
Total compensation expense for stock-based employee compensation awards
Total stock-based employee compensation	$ 260	$ 93