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Warrants (Schedule Of Unrealized Gain/(Loss) On Fair Value Of Warrants) (Details) (USD $)
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12 Months Ended |
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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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| Unrealized loss on fair value of warrants |
$ (5,180,107)rnn_UnrealizedLossOnFairValueOfWarrants
|
$ (1,365,654)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 loss on fair value of warrants |
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144rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_ExercisedAndExpiredWarrantsMember
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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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| Unrealized loss on fair value of warrants |
11rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateBSeriesIiiWarrantsMember
|
35,300rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized loss on fair value of warrants |
1rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateBWarrantsToPlacementAgentMember
|
3,488rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized loss on fair value of warrants |
(277,791)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateCWarrantsToInstitutionalInvestorsMember
|
53,765rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized loss on fair value of warrants |
10rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateDWarrantsToInstitutionalInvestorsMember
|
12,190rnn_UnrealizedLossOnFairValueOfWarrants
/ 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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| Unrealized loss on fair value of warrants |
(7,917)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateEWarrantsToInstitutionalInvestorsMember
|
(5,027)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 loss on fair value of warrants |
(4,120,103)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateFWarrantsToInstitutionalInvestorsMember
|
(1,598,195)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 loss on fair value of warrants |
(514,881)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateFWarrantsToPlacementAgentMember
|
(75,062)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 loss on fair value of warrants |
(1,272,731)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateGWarrantsToInstitutionalInvestorsMember
|
147,562rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateGWarrantsToInstitutionalInvestorsMember
|
| July 26, 2013 Warrants To Placement Agent [Member] |
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Unrealized loss on fair value of warrants |
(234,877)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateGWarrantsToPlacementAgentMember
|
26,681rnn_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 loss on fair value of warrants |
(940,100)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateHWarrantsToInstitutionalInvestorsMember
|
18,739rnn_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 loss on fair value of warrants |
(23,956)rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateHWarrantsToPlacementAgentMember
|
14,761rnn_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 loss on fair value of warrants |
$ 2,212,227rnn_UnrealizedLossOnFairValueOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= rnn_DateIWarrantsToInstitutionalInvestorsMember
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