Consolidated Statements of Cash Flows (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (12,540,261)us-gaap_NetIncomeLoss	$ (17,735,351)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided (used) by operating activities:
Depreciation, depletion, amortization, and accretion	9,702,192	5,752,361
Amortization of deferred financing cost and debt discount	8,426,119	4,809,081
Share-based compensation	959,823	1,241,701
Gain on sale of assets	(6,902,322)us-gaap_GainLossOnDispositionOfAssets	(7,015,950)us-gaap_GainLossOnDispositionOfAssets
Unrealized gain on derivatives	(7,639,441)	(682,505)
Interest and legal expense added to principal	1,818,240	4,591,088
Realized (gain) loss on warrant derivatives	(949,094)us-gaap_GainLossOnSaleOfDerivatives	7,000,000us-gaap_GainLossOnSaleOfDerivatives
Changes in operating assets and liabilities:
Accounts receivable, trade	835,263	(1,086,705)
Noncurrent other assets	(84,994)	(1,964)
Prepaid expenses and other current assets	246,632	(452,950)
Accounts payable and accrued expenses	5,495,034	73,206
Accounts payable drilling operator		(153,904)
Environmental settlement and related costs	6,600,000us-gaap_EnvironmentalRemediationExpense
Revenue payable	(39,577)	(98,568)
Net cash provided (used) by operating activities	5,927,614	(3,760,460)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of assets	19,332,078	11,451,244
Expenditures for oil and gas properties	(32,709,147)	(29,708,602)
Expenditures for property and equipment	(8,470)	(9,141)
Net cash used for investing activities	(13,385,539)	(18,266,499)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock		101,625
Stock options exercised	808,195	81,550
Financing costs paid	(4,806,656)us-gaap_PaymentsOfFinancingCosts	(122,230)us-gaap_PaymentsOfFinancingCosts
Payment on warrant derivative liability		(1,500,000)
Proceeds from notes payable	113,093,750us-gaap_ProceedsFromNotesPayable	25,000,000us-gaap_ProceedsFromNotesPayable
Proceeds from notes payable - related party		205,314us-gaap_ProceedsFromRelatedPartyDebt
Payments on notes payable	(102,779,666)us-gaap_RepaymentsOfNotesPayable	(20,552)us-gaap_RepaymentsOfNotesPayable
Net cash provided by financing activities	6,315,623	23,745,707
NET CHANGE IN CASH	(1,142,302)	1,718,748
CASH, BEGINNING OF YEAR	2,727,832us-gaap_Cash	1,009,084us-gaap_Cash
CASH, END OF YEAR	1,585,530us-gaap_Cash	2,727,832us-gaap_Cash
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION
Interest	11,623,165us-gaap_InterestPaid	6,016,039us-gaap_InterestPaid
Income Taxes	0us-gaap_IncomeTaxesPaid	0us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities
Accrued expenditures for oil and gas properties	3,079,681	2,344,893
Increase in asset retirement obligation	49,488	13,123
Warrant extinguishment added to loan		$ 7,500,000teng_WarrantExtinguishmentAddedToLoan

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: 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=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

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-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 14

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- Definition

The cash outflow for a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

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-Name Accounting Standards Codification

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