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Stock-Based Compensation (Narrative) (Details) (USD $)
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3 Months Ended |
12 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of options, Oustanding |
12,513,315us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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10,245,294us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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11,400,806us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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9,356,795us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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| Share-based employee compensation expense |
$ 272,386us-gaap_AllocatedShareBasedCompensationExpense
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$ 128,350us-gaap_AllocatedShareBasedCompensationExpense
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| Income tax benefit from share-based compensation |
0us-gaap_OtherTaxExpenseBenefit
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| Valuation allowance on deferred tax assets |
100.00%rnn_DeferredTaxAssetsValuationAllowancePercentage
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| Compensatory stock |
56,250us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
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336,000us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
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| Stock options granted |
3,426,316us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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975,999us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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| Stock option exercise price |
$ 0.72us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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$ 1.14us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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| Number of options exercised |
881,928us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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87,500us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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| Intrinsic value of options exercised |
98,051us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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48,125us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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| Share Based Compensation Arrangement By Share Based Payment Award Options Vested, Weighted Average Grant Date Fair Value |
$ 0.49rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue
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$ 0.81rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue
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| Unrecognized compensation cost |
2,850,341us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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1,423,150us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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| Weighted average vesting period, years |
3 years 2 months 12 days
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2 years 2 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 |
17,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= rnn_The2013PlanMember
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| Number of options, Oustanding |
6,404,815us-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 |
10,595,185us-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 |
6,108,500us-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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| Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Percentage |
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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| Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Percentage |
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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| Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Percentage |
40.00%rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage
/ us-gaap_VestingAxis
= rnn_ThirdAnniversaryMember
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| First Anniversary (B) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Percentage |
25.00%rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage
/ us-gaap_VestingAxis
= rnn_FirstAnniversaryOptionMember
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| Second Anniversary (B) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Percentage |
25.00%rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage
/ us-gaap_VestingAxis
= rnn_SecondAnniversaryOptionMember
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| Third Anniversary (B) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Percentage |
25.00%rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage
/ us-gaap_VestingAxis
= rnn_ThirdAnniversaryOptionMember
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| Fourth Anniversary (B) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Percentage |
25.00%rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage
/ us-gaap_VestingAxis
= rnn_FourthAnniversaryOptionMember
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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 |
5 years
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| Non-employee vesting period |
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 |
10 years
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| Non-employee vesting period |
3 years
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| Exercise Price Range $0.71 to $0.89 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted |
3,426,316us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeBMember
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| Stock option grants fair value |
1,698,737rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeBMember
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| Exercise Price Range $0.71 to $0.89 [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 |
$ 0.71us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeBMember
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| Exercise Price Range $0.71 to $0.89 [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 |
$ 0.89us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeBMember
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| Exercise Price Range $1.14 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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975,999us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeCMember
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| Stock option grants fair value |
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794,670rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeCMember
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| Exercise Price Range $1.14 to $1.35 [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option exercise price |
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$ 1.14us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rnn_ExercisePriceRangeCMember
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| Exercise Price Range $1.14 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_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 |
269,110us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= rnn_EmployeeTransactionMember
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109,442us-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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| Percentage of Event Occurence to Vest |
100.00%rnn_PercentageOfEventOccurenceToVest
/ us-gaap_TitleOfIndividualAxis
= rnn_NonEmployeeTransactionMember
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| Compensatory stock |
$ 3,276us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
/ us-gaap_TitleOfIndividualAxis
= rnn_NonEmployeeTransactionMember
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$ 18,908us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
/ us-gaap_TitleOfIndividualAxis
= rnn_NonEmployeeTransactionMember
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