Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Abstract]      
Deferred tax assets before valuation allowance $ 33,721,726 $ 37,683,765  
Net operating loss carryforwards 80,891,792 74,100,000  
Operating loss carryforwards due to stock-based compensation tax deductions in excess of book compensation expense 14,100,000 9,100,000  
R&D credit carryforwards 6,546,049 7,610,672  
Net operating loss carryforwards expired 20,800,000 16,600,000  
Net tax credit carryforwards expired 1,100,000 346,000  
Loss from Cardiosonix 14,000 19,000 15,000
Net operating loss carryforwards in Israel $ 7,600,000 $ 7,600,000