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Income Taxes (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| 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 | |
| X | ||||||||||
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- Definition
Net Income Loss From Subsidiary No definition available.
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- Definition
Represents the amount of net operating loss carryforwards that have expired during the reporting period. No definition available.
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- Definition
Represents the amount of net tax credit carryforwards that expired during the reporting period. No definition available.
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- Definition
Operating Loss Carryforwards Stock Based Compensation No definition available.
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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