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Stockholders' Equity - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
May 31, 2013
Directors
Dec. 31, 2013
Feb. 28, 2013
Employees
Apr. 30, 2014
Employees
Jan. 31, 2014
Nov. 30, 2013
Jan. 24, 2014
Aug. 31, 2014
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program     938,331us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised   30,500us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                
Common Stock Granted under Long term incentive plan     252,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross   446,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross                
Total share-based compensation expense $ 214,906us-gaap_AllocatedShareBasedCompensationExpense $ 283,892us-gaap_AllocatedShareBasedCompensationExpense $ 698,122us-gaap_AllocatedShareBasedCompensationExpense $ 919,755us-gaap_AllocatedShareBasedCompensationExpense                  
Outside Board Member [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price           $ 3.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_TypeOfArrangementAxis
= teng_OutsideBoardMemberMember
             
Share-based compensation, option vesting period           3 years              
Common Stock Granted under Long term incentive plan           100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TypeOfArrangementAxis
= teng_OutsideBoardMemberMember
             
Number of Directors           1teng_NumberOfDirectors
/ us-gaap_TypeOfArrangementAxis
= teng_OutsideBoardMemberMember
             
Expected term           5 years              
Eleven Employees [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
No of employees         11teng_NumberOfEmployees
/ us-gaap_TitleOfIndividualAxis
= teng_ElevenEmployeesMember
               
Common Stock Granted under Long term incentive plan             9,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= teng_ElevenEmployeesMember
           
Shares vested using fair market value         9,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_TitleOfIndividualAxis
= teng_ElevenEmployeesMember
  9,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_TitleOfIndividualAxis
= teng_ElevenEmployeesMember
           
Total share-based compensation expense         25,650us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= teng_ElevenEmployeesMember
               
Five Employees [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price               $ 2.50us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_TitleOfIndividualAxis
= teng_FiveEmployeesMember
         
Common stock granted under the long term incentive bonus program               42,000us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
/ us-gaap_TitleOfIndividualAxis
= teng_FiveEmployeesMember
         
No of employees               5teng_NumberOfEmployees
/ us-gaap_TitleOfIndividualAxis
= teng_FiveEmployeesMember
         
Compensation expense amortization period               3 years          
Five Employees [Member] | Other Than Performance Shares [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program               36,000us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
/ us-gaap_AwardTypeAxis
= teng_OtherThanPerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= teng_FiveEmployeesMember
         
Share-based compensation, option vesting period               3 years          
Five Employees [Member] | Performance Shares [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program               6,000us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= teng_FiveEmployeesMember
         
Share-based compensation, option vesting period               3 years          
Seven Employees and Five Outside Board Members [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price               $ 2.50us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_TitleOfIndividualAxis
= teng_SevenEmployeesAndFiveOutsideBoardMembersMember
         
No of employees               7teng_NumberOfEmployees
/ us-gaap_TitleOfIndividualAxis
= teng_SevenEmployeesAndFiveOutsideBoardMembersMember
         
Share-based compensation, option vesting period               3 years          
Common Stock Granted under Long term incentive plan               346,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= teng_SevenEmployeesAndFiveOutsideBoardMembersMember
         
Number of Directors               5teng_NumberOfDirectors
/ us-gaap_TitleOfIndividualAxis
= teng_SevenEmployeesAndFiveOutsideBoardMembersMember
         
Expected term               5 years          
Seven Employees and Five Outside Board Members [Member] | Performance Shares [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common Stock Granted under Long term incentive plan               12,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= teng_SevenEmployeesAndFiveOutsideBoardMembersMember
         
Three Employee [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price                 $ 3.80us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_TitleOfIndividualAxis
= teng_ThreeEmployeeMember
       
Common stock granted under the long term incentive bonus program                 21,000us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
/ us-gaap_TitleOfIndividualAxis
= teng_ThreeEmployeeMember
       
No of employees                 3teng_NumberOfEmployees
/ us-gaap_TitleOfIndividualAxis
= teng_ThreeEmployeeMember
       
Compensation expense amortization period                 3 years        
Three Employee [Member] | Other Than Performance Shares [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program                 21,000us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
/ us-gaap_AwardTypeAxis
= teng_OtherThanPerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= teng_ThreeEmployeeMember
       
Share-based compensation, option vesting period                 3 years        
Six Employees and Five Outside Board Members [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price                 $ 3.80us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_TitleOfIndividualAxis
= teng_SixEmployeesAndFiveOutsideBoardMembersMember
       
No of employees                 6teng_NumberOfEmployees
/ us-gaap_TitleOfIndividualAxis
= teng_SixEmployeesAndFiveOutsideBoardMembersMember
       
Share-based compensation, option vesting period                 3 years        
Common Stock Granted under Long term incentive plan                 252,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= teng_SixEmployeesAndFiveOutsideBoardMembersMember
       
Number of Directors                 5teng_NumberOfDirectors
/ us-gaap_TitleOfIndividualAxis
= teng_SixEmployeesAndFiveOutsideBoardMembersMember
       
Expected term                 5 years        
Jonathan J. Corp [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price                   0.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_JonathanCorpMember
     
Jonathan J. Corp [Member] | Common Stock [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program                   25,000us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_JonathanCorpMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Oppenheimer & Co., Inc [Member] | Common Stock [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program                     37,500us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_OpcoMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Clarence E. Smith [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program                   138,331us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BeneficialOwnerMember
  138,331us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BeneficialOwnerMember
 
Exercised price                   1.50invest_InvestmentOptionsExercisePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BeneficialOwnerMember
1.50invest_InvestmentOptionsExercisePrice
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BeneficialOwnerMember
   
Beneficial ownership percentage                   5.00%teng_PercentageOfBeneficialOwnership
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BeneficialOwnerMember
5.00%teng_PercentageOfBeneficialOwnership
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BeneficialOwnerMember
   
William F Woodburn [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price                         0.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_WilliamfWoodburnMember
William F Woodburn [Member] | Common Stock [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program                         400,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_WilliamfWoodburnMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Loren E Bagley [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price                         0.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_LoreneBagleyMember
Loren E Bagley [Member] | Common Stock [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program                         190,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_LoreneBagleyMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Mark D Woodburn [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price                         0.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_MarkdWoodburnMember
Mark D Woodburn [Member] | Common Stock [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program                         75,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_MarkdWoodburnMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Brett Greene [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price                         0.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_BrettGreeneMember
Brett Greene [Member] | Common Stock [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program                         10,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_BrettGreeneMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Jordan Corp [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price                         0.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_JordanCorpMember
Jordan Corp [Member] | Common Stock [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program                         20,998us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_JordanCorpMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
John G Corp [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock options granted, exercise price                         0.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_JohngCorpMember
John G Corp [Member] | Common Stock [Member]                          
Disclosure Stockholders Equity Additional Information Detail [Line Items]                          
Common stock granted under the long term incentive bonus program                         62,963us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= teng_JohngCorpMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember