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Income Taxes (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant components of the Company's deferred tax assets for federal income taxes      
Net operating loss carryforward $ 23,030,884us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 21,492,311us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Amortization   823,367us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Stock option compensation 6,083,848us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 5,841,333us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Deferred compensation   1,563,754us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation  
Deferred state tax   1,904,277us-gaap_DeferredTaxAssetsStateTaxes  
Other 26,783us-gaap_DeferredTaxAssetsOther 105,179us-gaap_DeferredTaxAssetsOther  
Valuation allowance (29,141,515)us-gaap_DeferredTaxAssetsValuationAllowance (26,274,933)us-gaap_DeferredTaxAssetsValuationAllowance  
Net deferred tax asset 0us-gaap_DeferredTaxAssetsNet 0us-gaap_DeferredTaxAssetsNet  
Intangible assets 2,274,526us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets 3,000,576us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets  
Deferred tax benefit 2,816,884us-gaap_DeferredIncomeTaxExpenseBenefit    
Outstanding shares of common stock 18,614,968us-gaap_CommonStockSharesOutstanding 5,813,785us-gaap_CommonStockSharesOutstanding 890,837us-gaap_CommonStockSharesOutstanding
Valuation allowance as a percentage of deferred tax assets 100.00%resx_DeferredTaxAssetsValuationAllowancePercentage 100.00%resx_DeferredTaxAssetsValuationAllowancePercentage  
Rate reconciliation:      
Federal tax benefit at statutory rate (6,009,398)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (922,591)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate  
State tax, net of Federal benefit (986,051)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (761,237)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes  
Change in valuation allowance 2,866,582us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 7,044,754us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Derivative accounting and other 1,311,983resx_IncomeTaxReconciliationDerivativeAccountingAndOther (5,360,926)resx_IncomeTaxReconciliationDerivativeAccountingAndOther  
Total provision (2,816,884)us-gaap_IncomeTaxExpenseBenefit    
Rate reconciliation (as a percent):      
Federal tax benefit at statutory rate (as a percent) (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
State tax, net of Federal benefit (as a percent) (5.70%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 28.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes  
Change in valuation allowance (as a percent) (10.90%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (267.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Derivative accounting and other (as a percent) 13.40%resx_EffectiveIncomeTaxRateDerivativeAccountingAndOther 273.40%resx_EffectiveIncomeTaxRateDerivativeAccountingAndOther  
Total provision (as a percent) (16.40%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Federal.      
Significant components of the Company's deferred tax assets for federal income taxes      
NOL carryforwards 57,521,560us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
47,728,300us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
 
California.      
Significant components of the Company's deferred tax assets for federal income taxes      
NOL carryforwards $ 50,440,965us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
$ 44,482,850us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember