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Warrants (Summary Of Shares Indexed To The Warrants) (Details)
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Dec. 31, 2014
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Dec. 31, 2013
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| Class of Warrant or Right [Line Items] |
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| Number of shares indexed |
13,205,871rnn_InvestmentWarrantsNumberOfSharesIndexed
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24,968,868rnn_InvestmentWarrantsNumberOfSharesIndexed
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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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| Number of shares indexed |
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1,555,555rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
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132,143rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
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1,228,333rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
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2,000,000rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
3,333,333rnn_InvestmentWarrantsNumberOfSharesIndexed
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateEWarrantsToInstitutionalInvestorsMember
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3,333,333rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
221,600rnn_InvestmentWarrantsNumberOfSharesIndexed
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateFWarrantsToInstitutionalInvestorsMember
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7,418,503rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
40,000rnn_InvestmentWarrantsNumberOfSharesIndexed
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateFWarrantsToPlacementAgentMember
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880,000rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
2,000,000rnn_InvestmentWarrantsNumberOfSharesIndexed
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateGWarrantsToInstitutionalInvestorsMember
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3,990,000rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
124,032rnn_InvestmentWarrantsNumberOfSharesIndexed
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateGWarrantsToPlacementAgentMember
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456,000rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
2,317,309rnn_InvestmentWarrantsNumberOfSharesIndexed
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateHWarrantsToInstitutionalInvestorsMember
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3,567,309rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
407,692rnn_InvestmentWarrantsNumberOfSharesIndexed
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateHWarrantsToPlacementAgentMember
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407,692rnn_InvestmentWarrantsNumberOfSharesIndexed
/ 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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| Number of shares indexed |
4,761,905rnn_InvestmentWarrantsNumberOfSharesIndexed
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateIWarrantsToInstitutionalInvestorsMember
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