Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
$ 22,872,051us-gaap_AssetsFairValueDisclosure
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$ 296,130us-gaap_AssetsFairValueDisclosure
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Warrant Liabilities |
3,768,351us-gaap_LiabilitiesFairValueDisclosure
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5,034,058us-gaap_LiabilitiesFairValueDisclosure
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Corporate Bonds [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
2,035,870us-gaap_AssetsFairValueDisclosure / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateBondSecuritiesMember
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State and Municipal Obligations [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
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100,000us-gaap_AssetsFairValueDisclosure / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
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Restricted Cash Equivalents [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
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196,130us-gaap_AssetsFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = rnn_RestrictedCashEquivalentsMember
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Certificates of Deposit [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
18,838,271us-gaap_AssetsFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember
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Commercial Paper [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
1,997,910us-gaap_AssetsFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
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Level 1 [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
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258,630us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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Level 1 [Member] | State and Municipal Obligations [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
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100,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
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Level 1 [Member] | Restricted Cash Equivalents [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
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158,630us-gaap_AssetsFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = rnn_RestrictedCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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Level 2 [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
22,872,051us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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37,500us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Level 2 [Member] | Corporate Bonds [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
2,035,870us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateBondSecuritiesMember
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Level 2 [Member] | Restricted Cash Equivalents [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
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37,500us-gaap_AssetsFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = rnn_RestrictedCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Level 2 [Member] | Certificates of Deposit [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
18,838,271us-gaap_AssetsFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Level 2 [Member] | Commercial Paper [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Total Assets: |
1,997,910us-gaap_AssetsFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Level 3 [Member] |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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Warrant Liabilities |
$ 3,768,351us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
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$ 5,034,058us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
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