Quarterly report pursuant to Section 13 or 15(d)

Warrants (Narrative) (Details)

v2.4.1.9
Warrants (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Class of Warrant or Right [Line Items]            
Number of warrants, Outstanding 13,205,871us-gaap_ClassOfWarrantOrRightOutstanding 24,968,868us-gaap_ClassOfWarrantOrRightOutstanding 13,205,871us-gaap_ClassOfWarrantOrRightOutstanding 18,921,902us-gaap_ClassOfWarrantOrRightOutstanding 13,205,871us-gaap_ClassOfWarrantOrRightOutstanding 24,968,868us-gaap_ClassOfWarrantOrRightOutstanding
Exercise price $ 1.07invest_InvestmentWarrantsExercisePrice $ 0.86invest_InvestmentWarrantsExercisePrice $ 1.07invest_InvestmentWarrantsExercisePrice $ 1.16invest_InvestmentWarrantsExercisePrice    
Warrant expiration date, start     Jul. 05, 2016      
Warrant expiration date, end     Jan. 21, 2019      
Average remaining contractual life of warrants outstanding     3 years   3 years 2 months 12 days  
Probability of entering into a fundamental transaction     5.00%rnn_ProbabilityOfEnteringIntoFundamentalTransaction      
Maximum [Member]            
Class of Warrant or Right [Line Items]            
Exercise price     $ 1.50invest_InvestmentWarrantsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		     
Minimum [Member]            
Class of Warrant or Right [Line Items]            
Exercise price     $ 0.41invest_InvestmentWarrantsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember