Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Narrative) (Details)

v2.4.1.9
Commitments And Contingencies (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended
Jul. 26, 2014
sqft
Jul. 01, 2013
Jun. 29, 2009
sqft
Jun. 22, 2009
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2009
Commitments And Contingencies [Line Items]              
Estimated cost to complete contracts         $ 9,780,000rnn_ResearchAndDevelopmentEstimatedCostToCompleteContractsWithVendors    
Office lease term         5 years    
Office space     5,466rnn_LeaseArea        
Addotional office space 1,637rnn_AdditionalLeaseArea            
License Costs             100,000us-gaap_LicenseCosts
One-time milestone payment       1,000,000rnn_ResearchAndDevelopementAgreementOneTimeMilestonePayment      
First achievement of marketing approvals       30 days      
Rent expense, current   100,210us-gaap_OperatingLeasesRentExpenseNet          
Employer matching contribution         100.00%rnn_DefinedContributionPlanEmployerMatchingContribution    
Maximum percentage of employee's gross pay         3.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Employer matching contribution on deferral         50.00%rnn_DefinedContributionPlanMaximumAnnualContributionPerEmployeeAdditionalPercentOnDeferral    
Percentage of employee's gross pay         2.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
Expense related to matching contribution         29,359us-gaap_DefinedContributionPlanCostRecognized 20,700us-gaap_DefinedContributionPlanCostRecognized  
Laboratory renewal term         1 year    
Maximum [Member]              
Commitments And Contingencies [Line Items]              
Contract term, months         36 months    
Minimum [Member]              
Commitments And Contingencies [Line Items]              
Contract term, months         2 months    
Lab Space Rental [Member]              
Commitments And Contingencies [Line Items]              
Rent expense, current         13,662us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= rnn_LabSpaceRentalMember
13,662us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= rnn_LabSpaceRentalMember
 
Montly rental committment         4,554rnn_MontlyRentalCommittment
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= rnn_LabSpaceRentalMember
4,554rnn_MontlyRentalCommittment
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= rnn_LabSpaceRentalMember
 
Office Space Rental [Member]              
Commitments And Contingencies [Line Items]              
Rent expense, current         $ 50,058us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= rnn_OfficeSpaceRentalMember
$ 25,053us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= rnn_OfficeSpaceRentalMember