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Prepaid Expenses, Deposits and Other Assets (Details) (USD $)
1 Months Ended 12 Months Ended
Jul. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Prepaid Expenses        
Price at which shares are granted as part of the agreement (in dollars per share)   $ 3.30us-gaap_SharePrice   $ 3.00us-gaap_SharePrice
Prepaid expenses, deposits and other assets   $ 2,286,930resx_PrepaidExpensesDepositsAndOtherAssets $ 2,743,319resx_PrepaidExpensesDepositsAndOtherAssets  
Maxim Group LLC        
Prepaid Expenses        
Term of agreement 3 years      
Number of shares of outstanding common stock granted as part of the agreement 210,250us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSharesApprovedForIssuance
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= resx_MaximGroupLLCMember
     
Price at which shares are granted as part of the agreement (in dollars per share) $ 15.00us-gaap_SharePrice
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= resx_MaximGroupLLCMember
     
Value of shares of outstanding common stock granted as part of the agreement 3,153,750us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionCapitalizedCost
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= resx_MaximGroupLLCMember
     
Value of shares of outstanding common stock recognized per quarter   262,813resx_ValueOfSharesOfCommonStockRecognizedPerQuarter
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= resx_MaximGroupLLCMember
   
Prepaid expenses, deposits and other assets   $ 1,576,875resx_PrepaidExpensesDepositsAndOtherAssets
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= resx_MaximGroupLLCMember