Quarterly report pursuant to Section 13 or 15(d)

Warrants (Schedule Of Assumptions Used In Calculating Fair Value Of Warrants) (Details)

v2.4.1.9
Warrants (Schedule Of Assumptions Used In Calculating Fair Value Of Warrants) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Warrants [Abstract]    
Trading market prices $ 0.73rnn_InvestmentWarrantsFairValueAssumptionsTradingMarketPrices $ 0.70rnn_InvestmentWarrantsFairValueAssumptionsTradingMarketPrices
Estimated future volatility 107.00%rnn_InvestmentWarrantsFairValueAssumptionsEstimatedFutureVolatilityRate 108.00%rnn_InvestmentWarrantsFairValueAssumptionsEstimatedFutureVolatilityRate
Estimated future risk-free rate, minimum 0.56%rnn_InvestmentWarrantsFairValueAssumptionsRiskFreeInterestRateMinimum 0.74%rnn_InvestmentWarrantsFairValueAssumptionsRiskFreeInterestRateMinimum
Estimated future risk-free rate, maximum 1.68%rnn_InvestmentWarrantsFairValueAssumptionsRiskFreeInterestRateMaximum 1.90%rnn_InvestmentWarrantsFairValueAssumptionsRiskFreeInterestRateMaximum
Equivalent volatility, minimum 51.00%rnn_InvestmentWarrantsFairValueAssumptionsEquivalentVolatilityMinimum 65.00%rnn_InvestmentWarrantsFairValueAssumptionsEquivalentVolatilityMinimum
Equivalent volatility, maximum 76.00%rnn_InvestmentWarrantsFairValueAssumptionsEquivalentVolatilityRateMaximum 78.00%rnn_InvestmentWarrantsFairValueAssumptionsEquivalentVolatilityRateMaximum
Equivalent risk-free rate, minimum 0.16%rnn_InvestmentWarrantsFairValueAssumptionsEquivalentRiskFreeRateMinimum 0.18%rnn_InvestmentWarrantsFairValueAssumptionsEquivalentRiskFreeRateMinimum
Equivalent risk-free rate, maximum 0.50%rnn_InvestmentWarrantsFairValueAssumptionsEquivalentRiskFreeRateMaximum 0.63%rnn_InvestmentWarrantsFairValueAssumptionsEquivalentRiskFreeRateMaximum