Stock-Based Compensation (Share-based Compensation Expense) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012 Cost of Sales	Dec. 31, 2011 Cost of Sales	Dec. 31, 2013 Cost of Sales	Dec. 31, 2012 Research and Development Expense	Dec. 31, 2011 Research and Development Expense	Dec. 31, 2013 Research and Development Expense	Dec. 31, 2012 Clinical and regulatory affairs	Dec. 31, 2011 Clinical and regulatory affairs	Dec. 31, 2013 Clinical and regulatory affairs	Dec. 31, 2012 Selling and Marketing Expense	Dec. 31, 2011 Selling and Marketing Expense	Dec. 31, 2013 Selling and Marketing Expense	Dec. 31, 2012 General and Administrative Expense	Dec. 31, 2011 General and Administrative Expense	Dec. 31, 2013 General and Administrative Expense	Dec. 31, 2012 Operating Expense	Dec. 31, 2011 Operating Expense	Dec. 31, 2013 Operating Expense	Dec. 31, 2013 Employee Stock Purchase Plan Common Stock	Dec. 31, 2012 Employee Stock Purchase Plan Common Stock	Dec. 31, 2011 Employee Stock Purchase Plan Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized			$ 5,800																			$ 750	$ 759	$ 733
Shares issed in period																						216	224	287
Allocated stock-based compensation expense	$ 6,452	$ 3,912	$ 7,922	$ 597	$ 209	$ 680	$ 1,336	$ 753	$ 486	$ 320	$ 113	$ 1,169	$ 1,558	$ 1,097	$ 3,117	$ 2,641	$ 1,740	$ 2,470	$ 5,855	$ 3,703	$ 7,242
Per share weighted average price of shares purchased																						$ 11.48	$ 10.59	$ 6.84