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Income Taxes (Schedule of Deferred Tax Assets) (Details) (USD $)
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Dec. 31, 2012
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Dec. 31, 2011
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| Deferred tax assets: | ||
| Net operating loss carryforwards | $ 24,767,569 | $ 29,701,483 |
| R&D credit carryforwards | 6,546,049 | 7,610,672 |
| Temporary differences | 2,408,108 | 371,610 |
| Deferred tax assets before valuation allowance | 33,721,726 | 37,683,765 |
| Valuation allowance | (33,721,726) | (37,683,765) |
| Net deferred tax assets |
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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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- Details
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. 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 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 temporary differences not separately disclosed. 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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- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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