Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Details)

v2.4.1.9
FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Details) (USD $)
12 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2013
Jun. 03, 2014
Assumptions used to estimate fair value        
Expected dividend yield (as a percent) 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate      
Fair value of common stock (in dollars per share)   5.54us-gaap_SharePrice 5.54us-gaap_SharePrice $ 6.00us-gaap_SharePrice
Monte Carlo option-valuation model | Financing Warrant | Minimum        
Assumptions used to estimate fair value        
Expected Life   6 years 6 months    
Risk Free Rate (as a percent)   1.57%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_FinancingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= resn_MonteCarloOptionPricingModelMember
   
Volatility (as a percent)   65.30%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_FinancingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= resn_MonteCarloOptionPricingModelMember
   
Monte Carlo option-valuation model | Financing Warrant | Maximum        
Assumptions used to estimate fair value        
Expected Life   7 years    
Risk Free Rate (as a percent)   2.28%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_FinancingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= resn_MonteCarloOptionPricingModelMember
   
Volatility (as a percent)   68.60%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_FinancingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= resn_MonteCarloOptionPricingModelMember
   
Monte Carlo option-valuation model | Senior Convertible Note Derivative Liability | Minimum        
Assumptions used to estimate fair value        
Expected Life   9 months    
Risk Free Rate (as a percent)   0.19%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= resn_MonteCarloOptionPricingModelMember
   
Volatility (as a percent)   81.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= resn_MonteCarloOptionPricingModelMember
   
Probability of a Capital Raise (as a percent)   75.00%resn_FairValueAssumptionsProbabilityOfCapitalRaiseRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= resn_MonteCarloOptionPricingModelMember
   
Monte Carlo option-valuation model | Senior Convertible Note Derivative Liability | Maximum        
Assumptions used to estimate fair value        
Expected Life   1 year 9 months    
Risk Free Rate (as a percent)   0.24%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= resn_MonteCarloOptionPricingModelMember
   
Volatility (as a percent)   102.10%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= resn_MonteCarloOptionPricingModelMember
   
Probability of a Capital Raise (as a percent)   90.00%resn_FairValueAssumptionsProbabilityOfCapitalRaiseRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= resn_MonteCarloOptionPricingModelMember
   
Black-Scholes option-pricing model | Remaining warrant liabilities | Minimum        
Assumptions used to estimate fair value        
Expected Life 3 years 6 months 29 days   4 years 29 days  
Risk Free Rate (as a percent) 1.25%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_RemainingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= resn_BlackScholesOptionPricingModelMember
  0.80%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_RemainingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= resn_BlackScholesOptionPricingModelMember
 
Volatility (as a percent) 64.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_RemainingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= resn_BlackScholesOptionPricingModelMember
  60.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_RemainingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= resn_BlackScholesOptionPricingModelMember
 
Black-Scholes option-pricing model | Remaining warrant liabilities | Maximum        
Assumptions used to estimate fair value        
Expected Life 5 years 11 months 12 days   7 years  
Risk Free Rate (as a percent) 2.31%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_RemainingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= resn_BlackScholesOptionPricingModelMember
  2.45%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_RemainingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= resn_BlackScholesOptionPricingModelMember
 
Volatility (as a percent) 69.60%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_RemainingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= resn_BlackScholesOptionPricingModelMember
  65.60%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= resn_RemainingWarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= resn_BlackScholesOptionPricingModelMember