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Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues:    
Grant revenue $ 103,880us-gaap_RevenueFromGrants $ 244,290us-gaap_RevenueFromGrants
Contract revenue 712,406us-gaap_ContractsRevenue 666,307us-gaap_ContractsRevenue
Total revenues 816,286us-gaap_Revenues 910,597us-gaap_Revenues
Cost of revenues (527,399)us-gaap_CostOfRevenue (628,981)us-gaap_CostOfRevenue
Gross profit 288,887us-gaap_GrossProfit 281,616us-gaap_GrossProfit
Operating expenses:    
Research and development 1,029,884us-gaap_ResearchAndDevelopmentExpense 1,030,621us-gaap_ResearchAndDevelopmentExpense
General and administrative 817,270us-gaap_GeneralAndAdministrativeExpense 840,904us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 1,847,154us-gaap_OperatingExpenses 1,871,525us-gaap_OperatingExpenses
Loss from operations (1,558,267)us-gaap_OperatingIncomeLoss (1,589,909)us-gaap_OperatingIncomeLoss
Other income (expense):    
Change in fair value of warrant liability (3,011,616)us-gaap_FairValueAdjustmentOfWarrants (1,742,090)us-gaap_FairValueAdjustmentOfWarrants
Interest income 561us-gaap_InterestIncomeExpenseNet 291us-gaap_InterestIncomeExpenseNet
Total other income (expense) (3,011,055)us-gaap_NonoperatingIncomeExpense (1,741,799)us-gaap_NonoperatingIncomeExpense
Net loss $ (4,569,322)us-gaap_NetIncomeLoss $ (3,331,708)us-gaap_NetIncomeLoss
Basic and diluted net loss per share $ (0.19)us-gaap_EarningsPerShareBasicAndDiluted $ (0.17)us-gaap_EarningsPerShareBasicAndDiluted
Basic and diluted weighted average common shares outstanding 24,405,813us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 19,739,470us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted