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Warrants (Schedule Of Unrealized Gain/(Loss) On Fair Value Of Warrants) (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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| Class of Warrant or Right [Line Items] |
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| Unrealized gain (loss) on fair value of warrants |
$ 115,415rnn_UnrealizedLossOnFairValueOfWarrants
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$ (11,660,524)rnn_UnrealizedLossOnFairValueOfWarrants
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| Exercised And Expired Warrants [Member] |
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| Class of Warrant or Right [Line Items] |
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| Unrealized gain (loss) on fair value of warrants |
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(744,301)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_ExercisedAndExpiredWarrantsMember
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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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| Unrealized gain (loss) on fair value of warrants |
102,077rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateEWarrantsToInstitutionalInvestorsMember
|
(1,473,973)rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized gain (loss) on fair value of warrants |
(2,897)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateFWarrantsToInstitutionalInvestorsMember
|
(4,225,702)rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized gain (loss) on fair value of warrants |
143rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateFWarrantsToPlacementAgentMember
|
(533,250)rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized gain (loss) on fair value of warrants |
(24,786)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateGWarrantsToInstitutionalInvestorsMember
|
(2,200,617)rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized gain (loss) on fair value of warrants |
4,345rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateGWarrantsToPlacementAgentMember
|
(293,538)rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized gain (loss) on fair value of warrants |
(17,760)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateHWarrantsToInstitutionalInvestorsMember
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(2,039,976)rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized gain (loss) on fair value of warrants |
15,179rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateHWarrantsToPlacementAgentMember
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(217,262)rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized gain (loss) on fair value of warrants |
$ 39,114rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateIWarrantsToInstitutionalInvestorsMember
|
$ 68,095rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateIWarrantsToInstitutionalInvestorsMember
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