|
Income Taxes (Schedule of Tax Rate Reconciliation) (Details) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Amount | |||
| Benefit at statutory rate | $ (12,147,068)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (14,517,816)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (9,913,450)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |
| Adjustments to valuation allowance | 12,925,380us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 15,399,021us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 8,604,147us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |
| Adjustments to R&D credit carryforwards | (340,886)us-gaap_IncomeTaxReconciliationTaxCreditsResearch | (842,414)us-gaap_IncomeTaxReconciliationTaxCreditsResearch | 1,064,623us-gaap_IncomeTaxReconciliationTaxCreditsResearch |
| Permanent items and other | (437,426)us-gaap_IncomeTaxReconciliationOtherAdjustments | (38,791)us-gaap_IncomeTaxReconciliationOtherAdjustments | 244,680us-gaap_IncomeTaxReconciliationOtherAdjustments |
| Benefit per financial statements | $ 0us-gaap_IncomeTaxExpenseBenefit | $ 0us-gaap_IncomeTaxExpenseBenefit | $ 0us-gaap_IncomeTaxExpenseBenefit |
| Percent | |||
| Benefit at statutory rate | (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |
| Adjustments to valuation allowance | 36.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 36.10%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 29.50%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance |
| Adjustments to R&D credit carryforwards | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch | (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch | 3.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch |
| Permanent items and other | (1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|