Stockholders' Equity (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total compensation expense for stock-based employee compensation awards
Total stock-based employee compensation	$ 13,259	$ 9,165	$ 3,980
Stock-based compensation expense to be recognized for equity awards outstanding
2014	11,944
2015	8,313
2016	2,544
2017	121
Total stock-based employee compensation yet to be recognized	22,922
Cost of goods sold
Total compensation expense for stock-based employee compensation awards
Total stock-based employee compensation	2,108	1,347	669
Sales and marketing expenses
Total compensation expense for stock-based employee compensation awards
Total stock-based employee compensation	3,941	2,133	1,201
General and administrative expenses
Total compensation expense for stock-based employee compensation awards
Total stock-based employee compensation	6,220	5,105	1,934
Research and development
Total compensation expense for stock-based employee compensation awards
Total stock-based employee compensation	$ 990	$ 580	$ 176