Quarterly report pursuant to Section 13 or 15(d)

Equipment, Net (Details)

v2.4.1.9
Equipment, Net (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Total fixed assets $ 695,105us-gaap_PropertyPlantAndEquipmentGross   $ 687,170us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization (615,239)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   (609,074)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net carrying amount 79,866us-gaap_PropertyPlantAndEquipmentNet   78,096us-gaap_PropertyPlantAndEquipmentNet
Depreciation and amortization expense 6,165us-gaap_Depreciation 9,044us-gaap_Depreciation  
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Total fixed assets 74,204us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
  70,320us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Office Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total fixed assets 61,944us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
  57,893us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Lab and computer equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total fixed assets 425,195us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= rnn_LabAndComputerEquipmentMember
  425,195us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= rnn_LabAndComputerEquipmentMember
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total fixed assets $ 133,762us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
  $ 133,762us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember