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U.S. Federal Tax Rate (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate [Line Items]    
Tax benefit computed at the federal statutory rate $ (5,701,569)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (8,466,361)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income tax (benefit), net of federal income tax effect (814,510)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (1,209,480)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Nondeductible permanent differences (143,271)us-gaap_IncomeTaxReconciliationNondeductibleExpense 6,042,555us-gaap_IncomeTaxReconciliationNondeductibleExpense
Change in valuation allowance 6,659,350us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 3,633,286us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Provision for income taxes $ 0us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems $ 0us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems