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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net loss $ (2,733,555)us-gaap_NetIncomeLoss $ (2,284,943)us-gaap_NetIncomeLoss $ (2,135,140)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 69,037us-gaap_DepreciationDepletionAndAmortization 78,862us-gaap_DepreciationDepletionAndAmortization 93,643us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation expense, including common stock issued for services 479,103us-gaap_ShareBasedCompensation 402,104us-gaap_ShareBasedCompensation 310,076us-gaap_ShareBasedCompensation
Changes in assets and liabilities:      
Grant funds receivable 61,568us-gaap_IncreaseDecreaseInReceivables 125,339us-gaap_IncreaseDecreaseInReceivables (82,733)us-gaap_IncreaseDecreaseInReceivables
Prepaid expenses and other current assets (934)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,268)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (12,593)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses (125,326)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (14,686)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (614,500)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Total adjustments 483,448us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 590,351us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities (306,107)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash used in operating activities (2,250,107)us-gaap_NetCashProvidedByUsedInOperatingActivities (1,694,592)us-gaap_NetCashProvidedByUsedInOperatingActivities (2,441,247)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Purchase of property and equipment (35,503)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (86,603)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment  
Net cash used in investing activities (35,503)us-gaap_NetCashProvidedByUsedInInvestingActivities (86,603)us-gaap_NetCashProvidedByUsedInInvestingActivities  
Cash flows from financing activities:      
Proceeds from sale of common stock 873,400us-gaap_ProceedsFromIssuanceOfCommonStock 1,643,333us-gaap_ProceedsFromIssuanceOfCommonStock 310,160us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from sale of preferred stock   1,615,798us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock 1,999,032us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Net cash provided in financing activities 873,400us-gaap_NetCashProvidedByUsedInFinancingActivities 3,259,131us-gaap_NetCashProvidedByUsedInFinancingActivities 2,309,192us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents (1,412,210)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 1,477,936us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (132,055)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 2,513,861us-gaap_CashAndCashEquivalentsAtCarryingValue 1,035,925us-gaap_CashAndCashEquivalentsAtCarryingValue 1,167,980us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 1,101,651us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,513,861us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,035,925us-gaap_CashAndCashEquivalentsAtCarryingValue