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Basis of Financial Statement Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended
Jan. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
May 31, 2014
Oct. 31, 2013
May 21, 2014
acre
Well
Basis Of Financial Statement Presentation And Significant Accounting Policies [Line Items]                    
Deferred gain on Republic PSA                   $ 6,959,816us-gaap_DeferredRevenueAndCreditsNoncurrent
Sales price                   15,000,000teng_PurchaseAndSaleAgreementSalesPrice
Number of acre interest sold                   2,239teng_PurchaseAndSaleAgreementAreaOfWellInterestSold
Percentage of profit in sales of assets                   25.00%teng_PurchaseAndSaleAgreementPercentageOfProfitInSaleOfAssets
Percentage of leasehold interest                   1.50%teng_PurchaseAndSaleAgreementPercentageOfLeaseholdInterest
Number of wells, royalty interest                   6teng_PurchaseAndSaleAgreementWellRoyaltyInterestNumber
Percentage of royalty interest in wells                   1.00%teng_PurchaseAndSaleAgreementPercentageOfWellRoyaltyInterest
Financing fees incurred           122,230teng_FinancingFeesIncurred 1,741,976teng_FinancingFeesIncurred      
Amortization of financing cost   555,072us-gaap_AmortizationOfFinancingCosts 369,859us-gaap_AmortizationOfFinancingCosts 905,875us-gaap_AmortizationOfFinancingCosts 701,807us-gaap_AmortizationOfFinancingCosts          
Written down on oil and gas properties             10,100,000us-gaap_ImpairmentOfOilAndGasProperties      
Sale of shallow wells 11,500,000us-gaap_ProceedsFromSaleOfWaterSystems                  
Asset impairment charge       0us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges          
Current portion of the asset retirement obligation   0us-gaap_AssetRetirementObligationCurrent   0us-gaap_AssetRetirementObligationCurrent   0us-gaap_AssetRetirementObligationCurrent        
Net operating loss carry forwards   65,000,000us-gaap_OperatingLossCarryforwards   65,000,000us-gaap_OperatingLossCarryforwards            
Net operating loss expiration       Various dates through 2033            
Current tax provision   0us-gaap_IncomeTaxReconciliationOtherReconcilingItems   0us-gaap_IncomeTaxReconciliationOtherReconcilingItems            
Income tax benefit recorded by offsetting NOLs or Alternative Minimum Tax against valuation allowance description       No tax benefit has been recorded in the consolidated financial statements for the remaining NOLs or Alternative Minimum Tax ("AMT") credit since the potential tax benefit is offset by a valuation allowance of the same amount.            
Income tax benefit   0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit          
Valuation allowance       100.00%teng_ValuationAllowanceRateOnDeferredTaxAssets            
Material unrecognized tax benefits   0us-gaap_UnrecognizedTaxBenefits   0us-gaap_UnrecognizedTaxBenefits   0us-gaap_UnrecognizedTaxBenefits        
Tax penalties   0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued   0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued   0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued        
Open Tax years       2010            
Material imbalances   0teng_MaterialImbalances   0teng_MaterialImbalances   0teng_MaterialImbalances        
Total share-based compensation expense   214,906us-gaap_AllocatedShareBasedCompensationExpense 283,892us-gaap_AllocatedShareBasedCompensationExpense 698,122us-gaap_AllocatedShareBasedCompensationExpense 919,755us-gaap_AllocatedShareBasedCompensationExpense          
Morgan Stanley [Member]                    
Basis Of Financial Statement Presentation And Significant Accounting Policies [Line Items]                    
Financing fees incurred               4,706,656teng_FinancingFeesIncurred
/ dei_LegalEntityAxis
= teng_MorganStanleyMember
   
Oppenheimer & Co., Inc [Member]                    
Basis Of Financial Statement Presentation And Significant Accounting Policies [Line Items]                    
Financing fees incurred                 $ 401,625teng_FinancingFeesIncurred
/ dei_LegalEntityAxis
= teng_OpcoMember
 
Marcellus Shale Wells [Member]                    
Basis Of Financial Statement Presentation And Significant Accounting Policies [Line Items]                    
Asset retirement obligation amortization period       40 years            
Minimum [Member] | Vehicles, Machinery and Equipment [Member]                    
Basis Of Financial Statement Presentation And Significant Accounting Policies [Line Items]                    
Asset retirement obligation amortization period       5 years            
Minimum [Member] | Pipelines and Other Related Equipment [Member]                    
Basis Of Financial Statement Presentation And Significant Accounting Policies [Line Items]                    
Asset retirement obligation amortization period       10 years            
Maximum [Member] | Vehicles, Machinery and Equipment [Member]                    
Basis Of Financial Statement Presentation And Significant Accounting Policies [Line Items]                    
Asset retirement obligation amortization period       10 years            
Maximum [Member] | Pipelines and Other Related Equipment [Member]                    
Basis Of Financial Statement Presentation And Significant Accounting Policies [Line Items]                    
Asset retirement obligation amortization period       25 years