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Damages for royalties that would have been earned.

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Damages for unpaid royalties.

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Expected Future Cost

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Length of Brussels Office Operating Lease

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Milestone commitments.

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Milestone time period.

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Minimum royalty payment per quarter since July 2011.

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Period of expected future expenses.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

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-Publisher SEC

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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-Name Statement of Financial Accounting Standard (FAS)

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Commitments and Contingencies (Details)	1 Months Ended	12 Months Ended
Commitments and Contingencies (Details)	Mar. 31, 2013 USD ($)	Apr. 26, 2013 USD ($)	Apr. 27, 2012 USD ($)	Apr. 29, 2011 USD ($)	Apr. 26, 2013 Other Clinical Studies And Registries [Member] USD ($)	Apr. 26, 2013 Flint Hills Scientific [Member] USD ($)	Apr. 26, 2013 Im Thera Medical Inc [Member] USD ($)	Apr. 26, 2013 Imricor Medical Systems [Member] USD ($)	Apr. 26, 2013 Cerbomed GmbH [Member] EUR (€)
Commitments And Contingencies [Line Items]
Minimum royalty payment per quarter since July 2011		$ 9,000
Damages for unpaid royalties		613,000
Damages for royalties that would have been earned		200,000,000
Expected future expense					2,800,000
Period of expected future expenses					2 years
Deferred revenue, unamortized		1,467,869	2,961,837
Milestone commitments						3,900,000	4,000,000	2,300,000	3,500,000
Milestone time period						2018	2014	2018
Brussels Office Operating Lease - Future Minimum Payments Due	2,200,000
Length of Brussels Office Operating Lease	9 years
Lease expenses		$ 700,000	$ 1,400,000	$ 3,400,000