Marketable Securities (Narrative) (Details) (USD $)
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Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] | |
Fair value | $ 22,872,051us-gaap_AvailableForSaleSecurities |
Unrealized losses | 33,769us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |
Certificates Of Deposit With Unrealized Losses [Member] | |
Schedule of Available-for-sale Securities [Line Items] | |
Fair value |
18,598,211us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = rnn_CertificatesOfDepositWithUnrealizedLossesMember |
Unrealized losses |
26,789us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = rnn_CertificatesOfDepositWithUnrealizedLossesMember |
Commercial Paper With Unrealized Losses [Member] | |
Schedule of Available-for-sale Securities [Line Items] | |
Fair value |
998,180us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = rnn_CommercialPaperWithUnrealizedLossesMember |
Unrealized losses |
153us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = rnn_CommercialPaperWithUnrealizedLossesMember |
Corporate Bond With Unrealized Losses [Member] | |
Schedule of Available-for-sale Securities [Line Items] | |
Fair value |
2,035,870us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = rnn_CorporateBondSecuritiesWithUnrealizedLossesMember |
Unrealized losses |
$ 6,827us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = rnn_CorporateBondSecuritiesWithUnrealizedLossesMember |
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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