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, 2012	Dec. 31, 2012 Cost of Sales [Member]	Dec. 31, 2011 Cost of Sales [Member]	Dec. 31, 2012 Cost of Sales [Member]	Dec. 31, 2012 Research and Development Expense [Member]	Dec. 31, 2011 Research and Development Expense [Member]	Dec. 31, 2012 Research and Development Expense [Member]	Dec. 31, 2012 Clinical and regulatory affairs [Member]	Dec. 31, 2011 Clinical and regulatory affairs [Member]	Dec. 31, 2012 Clinical and regulatory affairs [Member]	Dec. 31, 2012 Selling and Marketing Expense [Member]	Dec. 31, 2011 Selling and Marketing Expense [Member]	Dec. 31, 2012 Selling and Marketing Expense [Member]	Dec. 31, 2012 General and Administrative Expense [Member]	Dec. 31, 2011 General and Administrative Expense [Member]	Dec. 31, 2012 General and Administrative Expense [Member]	Dec. 31, 2012 Operating Expense [Member]	Dec. 31, 2011 Operating Expense [Member]	Dec. 31, 2012 Operating Expense [Member]	Dec. 31, 2012 Employee Stock Purchase Plan [Member] Common Stock [Member]	Dec. 31, 2011 Employee Stock Purchase Plan [Member] Common Stock [Member]	Dec. 31, 2010 Employee Stock Purchase Plan [Member] Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized																						$ 759	$ 733	$ 468
Shares issed in period																						224	287	293
Allocated stock-based compensation expense	$ 6,452	$ 3,912	$ 2,652	$ 597	$ 209	$ 188	$ 1,336	$ 753	$ 362	$ 320	$ 113	$ 15	$ 1,558	$ 1,097	$ 919	$ 2,641	$ 1,740	$ 1,168	$ 5,855	$ 3,703	$ 2,464
Per share weighted average price of shares purchased																						$ 10.59	$ 6.84	$ 3.81