Long-Term Debt And Credit Facilities (Narrative) (Details) (USD $)	12 Months Ended					3 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended		1 Months Ended			1 Months Ended		0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2011	Jun. 30, 2007	Dec. 31, 2012 Revolving Line Of Credit [Member]	Dec. 31, 2012 Term Note [Member]	Dec. 31, 2010 Term Note [Member]	Nov. 30, 2011 Healthcare Royalty Partners debt [Member]	Dec. 31, 2012 Healthcare Royalty Partners debt [Member]	May 31, 2012 Subordinated Convertible Debentures [Member] item	Jul. 31, 2008 Biosense Webster Advance [Member]	Dec. 31, 2010 2009 Amendment [Member] Revolving Line Of Credit [Member]	Dec. 31, 2010 Guarantees From Stockholders [Member] Revolving Line Of Credit [Member]	Nov. 30, 2010 Guarantees From Stockholders [Member] Revolving Line Of Credit [Member]	Mar. 30, 2012 March 30, 2012 Amendment [Member] Revolving Line Of Credit [Member]	May 01, 2012 May 1, 2012 Agreement [Member] Revolving Line Of Credit [Member]	May 10, 2012 May 10, 2012 Amendment [Member] Revolving Line Of Credit [Member]	Dec. 31, 2012 March 2013 Amendment [Member] Revolving Line Of Credit [Member]	Sep. 30, 2011 September 2011 Amendment [Member] Revolving Line Of Credit [Member]	Dec. 31, 2010 Principal Due 2013 [Member] Term Note [Member]	Dec. 31, 2010 Principal Due 2012 [Member] Term Note [Member]	Dec. 31, 2010 Principal Due 2011 [Member] Term Note [Member]	Jul. 31, 2008 Research And Development Expenses [Member] Biosense Webster Advance [Member]	Jul. 31, 2008 Royalty Amounts [Member] Biosense Webster Advance [Member]	Jul. 31, 2008 Prime Rate Plus [Member] Biosense Webster Advance [Member]	Dec. 31, 2010 Prime Rate Plus [Member] 2009 Amendment [Member] Revolving Line Of Credit [Member]	Dec. 31, 2010 Prime Rate Plus [Member] Guarantees From Stockholders [Member] Revolving Line Of Credit [Member]	Dec. 31, 2012 Prime Rate Plus [Member] September 2011 Amendment [Member] Term Note [Member]	Sep. 30, 2012 Prime Rate Plus [Member] September 2011 Amendment [Member] Term Note [Member]	Dec. 31, 2010 Prime Rate Plus [Member] 2010 Amendment To Loan Agreement [Member] Term Note [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity													$ 30,000,000	$ 10,000,000	$ 10,000,000	$ 10,000,000	$ 10,000,000	$ 20,000,000	$ 3,000,000	$ 20,000,000
Variable rate on interest				3.50%	1.00%																					0.75%	1.75%	0.50%	5.50%	5.50%	3.50%
Accrued interest on facility, floor													7.00%	6.00%
Decrease in maximum borrowing capacity																3,333,333
Warrants	6,099,476	1,038,161						11,111			2,500,000				80,000	75,735	60,976		113,636
Exercise price of warrants								36.00			3.361				40.15	6.60			1.98
Fair value of warrants issued	71,581							228,332							1,747,392
Current borrowing capacity						7,700,000												13,000,000
Paydown of the guarantees	7,000,000																	7,000,000
Net proceeds from issuance of long-term debt																		18,500,000
Line of credit facility, amount outstanding						7,300,000
Line of credit facility, remaining borrowing capacity						400,000
Line of Credit Facility, Current Borrowing Capacity						7,700,000												13,000,000
Term loan agreement, face value							2,000,000	10,000,000
Term loan principal amount due																					4,000,000	4,000,000	2,000,000
Amount borrowed	2,500,000	14,317,397							15,000,000
Additional amount which may be borrowed									5,000,000
Percentage of royalties entitled to									100.00%
Annual interest rate									16.00%		8.00%
Additional amount borrowed										2,500,000
Proceeds from Convertible Debt											8,500,000
Conversion price per share											$ 3.361
Number of convertible shares											2,500,000
Debt discount											7,500,000
Fair value of warrants											4,100,000
Fair value of derivative liability											3,500,000
Advance on royalty amounts												18,000,000												8,000,000	10,000,000
Research and development expenses, Biosense Webster	400,000	1,100,000	600,000
Disposables, service and accessories revenue, Biosense Webster	$ 3,200,000	$ 3,600,000	$ 3,900,000