Contingencies (Details) (USD $)	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Medtronic Litigation [Member] patent	Jun. 30, 2013 Medtronic Litigation [Member]	Sep. 30, 2012 Medtronic Litigation [Member]	Dec. 31, 2013 Medtronic Litigation [Member]	Dec. 31, 2011 Medtronic Litigation [Member]	Mar. 31, 2013 Medtronic Litigation [Member]	Mar. 31, 2014 Trademark Infringement [Member]	Dec. 31, 2010 Trademark Infringement [Member]	Dec. 31, 2011 Trademark Infringement [Member]	Dec. 10, 2012 Trademark Infringement [Member]
Legal Proceedings (Textual) [Abstract]
Number of patents assigned or licensed			12
Number of patents withdrawn			3
Number of patents remaining			9
Company's Patents in Initial Phase of Litigation			1
Number of Patents Selected for Litigation			3
Other Company's Patents in Initial Phase of Litigation			3
Litigation award	$ 30,000,000	$ 0			$ (101,200,000)		$ (101,200,000)
RoyaltyAccrualCharge						7,900,000
TransferOfFundsNotAvailableForWithdrawalOrUse			23,000,000
Company's cash and investment in escrow						113,300,000					62,500,000
Approximate loss contingency								13,000,000
Unrecorded royalty damages			700,000
Loss Contingency, Settlement Agreement, Consideration				7,500,000
Jury award									30,000,000	60,000,000
Release of funds from escrow												$ 62,500,000