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CardioFocus Settlement (Narrative) (Details) (USD $)	3 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended
CardioFocus Settlement (Narrative) (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Jul. 31, 2012 CardioFocus Settlement [Member]	Jun. 30, 2012 CardioFocus Settlement [Member]	Dec. 31, 2012 CardioFocus Settlement [Member]	Jul. 31, 2012 Payment [Member] Cardiogenesis [Member]
Business Acquisition [Line Items]
Loss recorded in general, administrative, and marketing expenses	$ 17,977,000	$ 17,970,000		$ 3,600,000
Legal settlement expenses					4,100,000
Settlement payment to CardioFocus			$ 4,500,000			$ 4,500,000

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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