Commitments and Contingencies (Details)		3 Months Ended				3 Months Ended
	Apr. 26, 2013 USD ($)	Jul. 26, 2013 Litigation Settlement [Member] USD ($)	Jul. 26, 2013 Other Clinical Studies And Registries [Member] USD ($)	Jul. 26, 2013 Flint Hills Scientific [Member] USD ($)	Jul. 26, 2013 Im Thera Medical Inc [Member] USD ($)	Jul. 26, 2013 Imricor Medical Systems [Member] USD ($)	Jul. 26, 2013 Cerbomed GmbH [Member] EUR (€)
Commitments And Contingencies [Line Items]
Claimed minimum royalty payment per quarter since July 2011		$ 9,000
Claimed damages for unpaid royalties on tunneling tool		613,000
Claimed damages for royalties that would have been earned		200,000,000
Cash Portion of Litigation Settlement		6,250,000
Product Portion Of Litigation Settlement measured in full systems to be delivered		200
Legal Fees Associated With Settlment		700,000
Litigation Settlement Expensed		7,400,000
Expected future expense			1,600,000
Period of expected future expenses			2 years
Deferred revenue, unamortized	1,467,869
Milestone commitments				$ 3,600,000	$ 4,000,000	$ 1,300,000	€ 3,500,000
Milestone time period				2019		2019