Assets percentage.

No definition available.

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- Definition

Interest and legal expense added to principal.

+ References

No definition available.

+ Details

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Namespace Prefix:	teng_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Loan principal balance.

+ References

No definition available.

+ Details

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Namespace Prefix:	teng_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage change in margin interest paid in cash.

+ References

No definition available.

+ Details

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Namespace Prefix:	teng_
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Balance Type:	na
Period Type:	duration

- Definition

Percentage of applicable interest rate margin paid in cash.

+ References

No definition available.

+ Details

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Namespace Prefix:	teng_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of applicable interest rate margin paid in kind.

+ References

No definition available.

+ Details

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Namespace Prefix:	teng_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of proceeds used for development.

+ References

No definition available.

+ Details

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Namespace Prefix:	teng_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount paid to managing member or general partner, affiliate of managing member or general partner, or affiliate of limited liability company (LLC) or limited partnership (LP) for administrative services provided to the LLC or LP, for example, but not limited to, salaries, rent, or overhead costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_CreditFacilityAxis=teng_NetProfitsInterestAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Notes Payable (First Amendment and Waiver) - Additional Information (Detail) - USD ($)			1 Months Ended															9 Months Ended
	Sep. 30, 2015	Jul. 31, 2015	Sep. 30, 2016	Aug. 31, 2016	Jul. 31, 2016	Jun. 30, 2016	May 31, 2016	Apr. 30, 2016	Mar. 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Dec. 31, 2015	Nov. 30, 2015	Oct. 31, 2015	Sep. 30, 2015	Aug. 31, 2015	Jul. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Percentage of applicable interest rate margin paid in cash		12.00%
Percentage of applicable interest rate margin paid in kind		14.00%
Percentage change from margin interest paid in cash		9.00%
Credit facility, maturity date		Dec. 31, 2016
Borrower's proved reserves																		Greater than 1.5 times the net debt
Repayment of debt by borrower	$ 30,000,000
Proceeds from sale of assets		$ 17,000,000
Percentage of proceeds that can be used for development		50.00%
Total fees paid to administrative agent		$ 4,000,000
Loan balance		$ 1,000,000															$ 1,000,000
Interest and legal expense added to principal																		$ 17,194,747	$ 4,917,077
Net Profits Interest Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Percentage of increase in NPI assets after sale		2.00%
Net Profits Interest Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of increase in NPI assets after sale		11.00%
First Amendment and Waiver [Member]
Debt Instrument [Line Items]
Interest and legal expense added to principal			$ 5,914,048	$ 5,914,048	$ 5,914,048	$ 5,604,715	$ 5,604,715	$ 5,604,715	$ 5,370,581	$ 5,370,581	$ 5,370,581	$ 5,194,760	$ 5,194,760	$ 5,194,760	$ 3,917,077	$ 3,917,077	$ 3,917,077	$ 1,000,000
Interest rate of loan borrowed			17.00%															17.00%