Long-Term Debt And Credit Facilities (Narrative) (Details) (USD $)	9 Months Ended	3 Months Ended		1 Months Ended	9 Months Ended	1 Months Ended			1 Months Ended				0 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Revolving Line Of Credit [Member]	Sep. 30, 2012 Term Note [Member]	Nov. 30, 2011 Cowen Debt [Member]	Sep. 30, 2012 Cowen Debt [Member]	May 31, 2012 Subordinated Convertible Debentures [Member]	Sep. 30, 2012 Subordinated Convertible Debentures [Member]	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]	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]	Sep. 30, 2011 September 2011 Amendment [Member] Revolving Line Of Credit [Member]	Sep. 30, 2012 Principal Due 2013 [Member] Term Note [Member]	Sep. 30, 2012 Principal Due 2012 [Member] Term Note [Member]	Sep. 30, 2012 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]	Sep. 30, 2012 Prime Rate Plus [Member] September 2011 Amendment [Member] Term Note [Member]	Sep. 30, 2012 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	$ 20,000,000	$ 20,000,000
Variable rate on interest																				0.75%	1.75%	0.50%	5.50%	3.50%
Accrued interest on facility, floor									7.00%	6.00%
Decrease in maximum borrowing capacity											3,333,333
Number of warrants issued			11,111			2,500,000					75,735	60,976
Exercise price of warrants			$ 36.00			$ 3.361					$ 6.60
Fair value of warrants issued	114,174		228,332
Current borrowing capacity													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		8,200,000
Line of credit facility, remaining borrowing capacity		8,200,000
Term loan agreement, face value			10,000,000
Term loan principal amount due															4,000,000	4,000,000	2,000,000
Amount borrowed	2,500,000			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