Contingencies (Details)							1 Months Ended			3 Months Ended			6 Months Ended
	Mar. 18, 2016 USD ($)	Feb. 22, 2016 USD ($)	Jul. 20, 2015 USD ($)	Dec. 02, 2014 USD ($)	Apr. 25, 2013 USD ($)	Sep. 20, 2011 USD ($) patent	Jul. 31, 2015 USD ($)	Oct. 31, 2010 USD ($)	Aug. 31, 2008 patent	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2016 USD ($) patent	Jun. 30, 2015 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Mar. 02, 2015 USD ($)	Dec. 31, 2011 USD ($)
Loss Contingencies [Line Items]
Litigation accrual adjustment										$ 43,310,000	$ (568,000)	$ 42,575,000	$ 43,310,000	$ 42,007,000
Litigation loss offset														3,300,000
Loss contingency, estimate of possible loss																		$ 87,600,000
Unrecorded royalty damages										0			0
Litigation accrual																$ 88,261,000
Litigation accrual										45,140,000			45,140,000
OIG [Member]
Loss Contingencies [Line Items]
Loss contingency, settlement agreement, consideration							$ 13,500,000
Litigation accrual adjustment														13,800,000
Litigation loss offset														13,800,000
Medtronic Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, settlement agreement, consideration					$ 7,500,000					45,000,000			45,000,000
Litigation accrual adjustment										43,300,000			$ 43,300,000	56,400,000
Number of patents assigned or licensed | patent									12				9
Number of patents withdrawn | patent													3
Number of patents selected for litigation | patent						3
Company's patents in initial phase of litigation | patent						1
Litigation, damages awarded						$ 101,200,000
Loss contingency, settlement agreement, court													On May 15, 2013, the District Court granted the parties’ joint motion to dismiss claims relating to one of the three Medtronic patents pursuant to a settlement agreement, leaving two Medtronic patents remaining in the litigation. On June 11, 2013, the District Court granted the parties ongoing royalties with respect to the two Medtronic patents and the one Company patent remaining in the first phase of the case (the “June 2013 ruling”).
Company's cash and investment in escrow													$ 113,300,000
Release of funds from escrow																	$ 114,100,000
Litigation liability																			$ 101,200,000
Royalty accrual charge													7,900,000
Unrecorded royalty damages										700,000			700,000
Litigation accrual															$ 88,300,000
Litigation accrual										45,000,000			45,000,000
Trademark Infringement [Member]
Loss Contingencies [Line Items]
Loss contingency, settlement agreement, consideration			$ 27,200,000
Litigation accrual adjustment											$ 2,800,000			$ 2,800,000
Company's cash and investment in escrow				$ 32,500,000
Litigation liability										60,000,000			60,000,000
Litigation accrual										0			0
Jury award								$ 60,000,000
Restricted cash										0			$ 0
Madsen Medical, Inc. Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, settlement agreement, court													On March 18, 2016, the trial court entered judgment in favor of MMI in the amount of $27.8 million, which amount excluded the $14.0 million disgorgement awarded by the jury.
Loss contingency, estimate of possible loss										$ 0			$ 0
Jury award	$ 27,800,000
Madsen Medical, Inc. Litigation [Member] | Loss Profits for Tortious Interference [Member]
Loss Contingencies [Line Items]
Jury award		$ 7,500,000
Madsen Medical, Inc. Litigation [Member] | Unjust Enrichment [Member]
Loss Contingencies [Line Items]
Jury award		14,000,000
Madsen Medical, Inc. Litigation [Member] | Punitive Damages [Member]
Loss Contingencies [Line Items]
Jury award		20,000,000
Madsen Medical, Inc. Litigation [Member] | Damages for Breach of Contract [Member]
Loss Contingencies [Line Items]
Jury award		$ 300,000