Warrants (Schedule Of Fair Value Of Warrants Issued) (Details) (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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Oct. 16, 2013
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Jul. 26, 2013
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Class of Warrant or Right [Line Items] |
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Fair value |
$ 3,768,351rnn_InvestmentWarrantsFairValue
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$ 5,034,058rnn_InvestmentWarrantsFairValue
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$ 87,368rnn_InvestmentWarrantsFairValue
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$ 110,489rnn_InvestmentWarrantsFairValue
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June 5, 2009 Series III Warrants [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
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11rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateBSeriesIiiWarrantsMember
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June 5, 2009 Warrants To Placement Agent [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
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1rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateBWarrantsToPlacementAgentMember
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October 23, 2009 Warrants To Institutional Investors [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
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19,689rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateCWarrantsToInstitutionalInvestorsMember
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June 30, 2010 Warrants To Institutional Investors [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
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10rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateDWarrantsToInstitutionalInvestorsMember
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March 31, 2011 Warrants To Institutional Investors [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
319,277rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateEWarrantsToInstitutionalInvestorsMember
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311,360rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateEWarrantsToInstitutionalInvestorsMember
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December 4, 2012 Warrants To Institutional Investors [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
90,052rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateFWarrantsToInstitutionalInvestorsMember
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2,124,444rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateFWarrantsToInstitutionalInvestorsMember
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December 4, 2012 Warrants To Placement Agent [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
14,595rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateFWarrantsToPlacementAgentMember
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222,286rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateFWarrantsToPlacementAgentMember
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July 26, 2013 Warrants To Institutional Investors [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
788,314rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateGWarrantsToInstitutionalInvestorsMember
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1,148,390rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateGWarrantsToInstitutionalInvestorsMember
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July 26, 2013 Warrants To Placement Agent [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
30,594rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateGWarrantsToPlacementAgentMember
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83,808rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateGWarrantsToPlacementAgentMember
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October 16, 2013 Warrants To Institutional Investors [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
949,756rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateHWarrantsToInstitutionalInvestorsMember
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1,051,454rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateHWarrantsToInstitutionalInvestorsMember
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October 16, 2013 Warrants To Placement Agent [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
96,563rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateHWarrantsToPlacementAgentMember
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72,605rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateHWarrantsToPlacementAgentMember
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January 21, 2014 Warrants To Institutional Investors [Member] |
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Class of Warrant or Right [Line Items] |
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Fair value |
$ 1,479,200rnn_InvestmentWarrantsFairValue / us-gaap_ClassOfWarrantOrRightAxis = rnn_DateIWarrantsToInstitutionalInvestorsMember
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