Settlement Costs - License Agreement Dispute (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Settlement Costs License Agreement Dispute [Abstract]
License agreement settlement		$ 3,000,000	$ 0	$ 0
Accrued Royalties		1,200,000
Settlement costs license agreement dispute	1,821,000	0	1,821,000	0
Royalty Expense Pursuant to License Agreement			$ 1,500,000