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Stock-Based Compensation (Narrative) (Details) (USD $)
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0 Months Ended |
3 Months Ended |
12 Months Ended |
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Apr. 14, 2014
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Mar. 16, 2015
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of options, Oustanding |
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11,400,806us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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9,356,795us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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7,741,795us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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| Share-based employee compensation expense |
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$ 608,795us-gaap_AllocatedShareBasedCompensationExpense
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$ 565,428us-gaap_AllocatedShareBasedCompensationExpense
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| Income tax benefit from share-based compensation |
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0us-gaap_OtherTaxExpenseBenefit
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| Valuation allowance on deferred tax assets |
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100.00%rnn_DeferredTaxAssetsValuationAllowancePercentage
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| Compensatory stock |
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409,000us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
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306,800us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
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| Stock options granted |
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3,376,316us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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2,528,499us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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2,450,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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| Stock option exercise price |
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$ 0.96us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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$ 0.39us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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| Number of options exercised |
125,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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448,693us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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375,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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| Intrinsic value of options exercised |
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115,528us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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91,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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| Share Based Compensation Arrangement By Share Based Payment Award Options Vested, Weighted Average Grant Date Fair Value |
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$ 0.69rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue
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$ 0.28rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue
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| Unrecognized compensation cost |
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1,423,150us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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281,957us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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| Weighted average vesting period, years |
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2 years 2 months 12 days
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1 year 8 months 12 days
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| The 2013 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options authorized for issuance |
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17,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= rnn_The2013PlanMember
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| Number of options, Oustanding |
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2,978,499us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= rnn_The2013PlanMember
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| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |
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14,021,501us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= rnn_The2013PlanMember
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| The 2003 Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of options, Oustanding |
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8,422,307us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= rnn_The2003PlanMember
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| First Anniversary [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting percentage |
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30.00%rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage
/ us-gaap_VestingAxis
= rnn_FirstAnniversaryMember
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| Second Anniversary [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting percentage |
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30.00%rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage
/ us-gaap_VestingAxis
= rnn_SecondAnniversaryMember
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| Third Anniversary [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting percentage |
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40.00%rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage
/ us-gaap_VestingAxis
= rnn_ThirdAnniversaryMember
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| Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expiration of options from grant date, years |
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5 years
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| Non-employee vesting period |
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1 year
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| Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expiration of options from grant date, years |
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10 years
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| Non-employee vesting period |
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3 years
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| Exercise Price Range $0.68 to $1.35 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted |
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2,528,499us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeBMember
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| Stock option grants fair value |
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1,737,087rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeBMember
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| Exercise Price Range $0.68 to $1.35 [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option exercise price |
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$ 0.68us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeBMember
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| Exercise Price Range $0.68 to $1.35 [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option exercise price |
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$ 1.35us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeBMember
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| Exercise Price Range $0.31 to $0.61 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted |
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2,450,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeCMember
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| Stock option grants fair value |
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681,752rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeCMember
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| Exercise Price Range $0.31 to $0.61 [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option exercise price |
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$ 0.31us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeCMember
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| Exercise Price Range $0.31 to $0.61 [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option exercise price |
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$ 0.61us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeCMember
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| Employee Transaction [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share-based employee compensation expense |
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587,414us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= rnn_EmployeeTransactionMember
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553,163us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= rnn_EmployeeTransactionMember
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| Non-Employee Transaction [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Compensatory stock |
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$ 21,381us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
/ us-gaap_TitleOfIndividualAxis
= rnn_NonEmployeeTransactionMember
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$ 12,265us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
/ us-gaap_TitleOfIndividualAxis
= rnn_NonEmployeeTransactionMember
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