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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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