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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net loss $ (700,454)us-gaap_NetIncomeLoss $ (615,918)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 7,234us-gaap_DepreciationDepletionAndAmortization 16,372us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation expense 16,902us-gaap_ShareBasedCompensation 26,307us-gaap_ShareBasedCompensation
Changes in assets and liabilities:    
Grant funds receivable 31,386us-gaap_IncreaseDecreaseInReceivables 140,909us-gaap_IncreaseDecreaseInReceivables
Prepaid expenses and other current assets (3,657)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 5,801us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses 29,707us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (77,006)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Total adjustments 81,572us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 112,383us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash used in operating activities (618,882)us-gaap_NetCashProvidedByUsedInOperatingActivities (503,535)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Purchase of property and equipment (15,850)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment  
Net cash used in investing activities (15,850)us-gaap_NetCashProvidedByUsedInInvestingActivities  
Cash flows from financing activities:    
Net proceeds from sale of preferred stock 2,679,809us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock  
Net cash provided by financing activities 2,679,809us-gaap_NetCashProvidedByUsedInFinancingActivities  
Net increase (decrease) in cash and cash equivalents 2,045,077us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (503,535)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 1,101,651us-gaap_CashAndCashEquivalentsAtCarryingValue 2,513,861us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 3,146,728us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,010,326us-gaap_CashAndCashEquivalentsAtCarryingValue