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Stockholder's Equity (Details) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Class of Warrant or Right [Line Items]    
Number of shares of common stock to be purchased 4,815,266us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights  
Weighted average exercise price $ 8.58resx_ClassOfWarrantOrRightWeightedAverageExercisePrice  
Warrants to purchase common stock    
Class of Warrant or Right [Line Items]    
Warrants exercised 0resx_ClassOfWarrantOrRightExercisedNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= resx_CommonStockWarrantsMember
 
Warrants expired unexercised 8,500resx_ClassOfWarrantOrRightExpiredUnexercised
/ us-gaap_ClassOfWarrantOrRightAxis
= resx_CommonStockWarrantsMember
 
Warrants to purchase common stock | Independent consultant    
Class of Warrant or Right [Line Items]    
Term of warrants 5 years  
Number of shares of common stock to be purchased 15,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
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/ us-gaap_CounterpartyNameAxis
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Exercise price of warrants $ 4.90us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
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/ us-gaap_CounterpartyNameAxis
= resx_IndependentConsultantMember
 
Vesting term of warrants 1 year  
Number of warrants vested 2,500resx_ClassOfWarrantOrRightVestedNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= resx_CommonStockWarrantsMember
/ us-gaap_CounterpartyNameAxis
= resx_IndependentConsultantMember
 
Warrant expense $ 2,993resx_WarrantExpense
/ us-gaap_ClassOfWarrantOrRightAxis
= resx_CommonStockWarrantsMember
/ us-gaap_CounterpartyNameAxis
= resx_IndependentConsultantMember
 
Warrants to purchase common stock | Investor relations firm    
Class of Warrant or Right [Line Items]    
Term of warrants   5 years
Number of shares of common stock to be purchased   250,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= resx_CommonStockWarrantsMember
/ us-gaap_CounterpartyNameAxis
= resx_InvestorRelationsFirmMember
Exercise price of warrants   $ 3.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= resx_CommonStockWarrantsMember
/ us-gaap_CounterpartyNameAxis
= resx_InvestorRelationsFirmMember
Agreement term   1 year
Fair value of warrants outstanding 517,576us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= resx_CommonStockWarrantsMember
/ us-gaap_CounterpartyNameAxis
= resx_InvestorRelationsFirmMember
 
Warrants to purchase common stock | Investor relations firm | General and administrative    
Class of Warrant or Right [Line Items]    
Fair value of warrants outstanding $ 129,430us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
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/ us-gaap_CounterpartyNameAxis
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Minimum    
Class of Warrant or Right [Line Items]    
Exercise price of warrants $ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum    
Class of Warrant or Right [Line Items]    
Exercise price of warrants $ 200.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember