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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current Assets:    
Cash and cash equivalents $ 1,278,941us-gaap_CashAndCashEquivalentsAtCarryingValue $ 8,055,385us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash restricted pursuant to letters of credit 52,488us-gaap_RestrictedCashAndCashEquivalents 302,488us-gaap_RestrictedCashAndCashEquivalents
Current portion of deferred financing costs    968,004us-gaap_DeferredFinanceCostsNet
Prepaid expenses and other current assets 490,824us-gaap_PrepaidExpenseAndOtherAssetsCurrent 49,221us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 1,822,253us-gaap_AssetsCurrent 9,375,098us-gaap_AssetsCurrent
Property and equipment, net 1,138,593us-gaap_PropertyPlantAndEquipmentNet 1,495,807us-gaap_PropertyPlantAndEquipmentNet
Other assets:    
Intangible assets, net 9,625,000us-gaap_IntangibleAssetsNetExcludingGoodwill 9,625,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Deferred financing costs    2,581,324us-gaap_DeferredFinanceCostsNoncurrentNet
Other assets 9,990us-gaap_OtherAssetsNoncurrent 12,066us-gaap_OtherAssetsNoncurrent
Total other assets 9,634,990us-gaap_AssetsNoncurrent 12,218,390us-gaap_AssetsNoncurrent
Total assets 12,595,836us-gaap_Assets 23,089,295us-gaap_Assets
Current liabilities:    
Accounts payable 1,801,469us-gaap_AccountsPayableCurrent 1,036,320us-gaap_AccountsPayableCurrent
Accrued and other current liabilities 968,392us-gaap_AccruedLiabilitiesCurrent 1,411,107us-gaap_AccruedLiabilitiesCurrent
Deferred revenue from licensing arrangements, current portion    76,428us-gaap_DeferredRevenueCurrent
Current portion of capital lease obligation    1,361us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Derivative warrant liability 208,155us-gaap_DerivativeLiabilitiesCurrent 1,119,155us-gaap_DerivativeLiabilitiesCurrent
Total current liabilities 2,978,016us-gaap_LiabilitiesCurrent 3,644,371us-gaap_LiabilitiesCurrent
Deferred revenue from licensing arrangements, net of current portion 95,535us-gaap_DeferredRevenueNoncurrent 76,428us-gaap_DeferredRevenueNoncurrent
Total liabilities 3,073,551us-gaap_Liabilities 3,720,799us-gaap_Liabilities
Stockholders' equity:    
Common stock, $0.01 par value, authorized 150,000,000 shares, issued and outstanding 11,776,578 and 4,437,346 shares at December 31, 2013 and 2012, respectively 126,295us-gaap_CommonStockValue 117,764us-gaap_CommonStockValue
Additional paid-in capital 137,292,157us-gaap_AdditionalPaidInCapital 132,192,648us-gaap_AdditionalPaidInCapital
Accumulated deficit (127,932,066)us-gaap_RetainedEarningsAccumulatedDeficit (112,969,412)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 9,522,285us-gaap_StockholdersEquity 19,368,496us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 12,595,836us-gaap_LiabilitiesAndStockholdersEquity 23,089,295us-gaap_LiabilitiesAndStockholdersEquity
SeriesCPreferredStock [Member]    
Stockholders' equity:    
Preferred Stock, $0.01 par value; 40,000,000 shares authorized: C - 10,000 shares authorized; issued and outstanding 1,000 shares; D - 3,600,000 shares authorized; issued and outstanding 1,000,000 shares; E - 1,748,613 shares authorized, issued and outstanding; F - 5,000,000 shares authorized; issued and outstanding 840,336 shares 10us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		 10us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
SeriesDPreferredStock [Member]    
Stockholders' equity:    
Preferred Stock, $0.01 par value; 40,000,000 shares authorized: C - 10,000 shares authorized; issued and outstanding 1,000 shares; D - 3,600,000 shares authorized; issued and outstanding 1,000,000 shares; E - 1,748,613 shares authorized, issued and outstanding; F - 5,000,000 shares authorized; issued and outstanding 840,336 shares 10,000us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		 10,000us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
Series E Preferred Stock [Member]    
Stockholders' equity:    
Preferred Stock, $0.01 par value; 40,000,000 shares authorized: C - 10,000 shares authorized; issued and outstanding 1,000 shares; D - 3,600,000 shares authorized; issued and outstanding 1,000,000 shares; E - 1,748,613 shares authorized, issued and outstanding; F - 5,000,000 shares authorized; issued and outstanding 840,336 shares 17,486us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember		 17,486us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Series F Preferred Stock [Member]    
Stockholders' equity:    
Preferred Stock, $0.01 par value; 40,000,000 shares authorized: C - 10,000 shares authorized; issued and outstanding 1,000 shares; D - 3,600,000 shares authorized; issued and outstanding 1,000,000 shares; E - 1,748,613 shares authorized, issued and outstanding; F - 5,000,000 shares authorized; issued and outstanding 840,336 shares $ 8,403us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember