Represents the current ratio (as defined in the Exit Credit Agreement).

No definition available.

Name:	batl_CurrentRatio
Namespace Prefix:	batl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Incremental percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	batl_DebtInstrumentBasisSpreadOnVariableRateIncremental
Namespace Prefix:	batl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The threshold total net indebtedness leverage ratio under the debt instrument.

+ References

No definition available.

+ Details

Name:	batl_DebtInstrumentThresholdTotalNetIndebtednessLeverageRatio
Namespace Prefix:	batl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of consecutive semi-annual redeterminations between which the entity and the lenders, each of whom have the right to a specified number of interim unscheduled redeterminations of the borrowing base under the credit facility.

+ References

No definition available.

+ Details

Name:	batl_LineOfCreditFacilityBorrowingBaseNumberOfConsecutiveSemiAnnualRedeterminationsBetweenWhichInterimUnscheduledRedeterminationIsAvailable
Namespace Prefix:	batl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of interim unscheduled redeterminations of borrowing base available to the entity and the lender under the credit facility.

+ References

No definition available.

+ Details

Name:	batl_LineOfCreditFacilityBorrowingBaseNumberOfInterimUnscheduledRedeterminationAvailable
Namespace Prefix:	batl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum volume allowed under commodity hedging agreements expressed as a percentage of projected production.

+ References

No definition available.

+ Details

Name:	batl_LineOfCreditFacilityCovenantCommodityHedgingAgreementMinimumVolumePercentage
Namespace Prefix:	batl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum asset dispositions or swap terminations in fiscal year before direct reduction in the borrowing base

+ References

No definition available.

+ Details

Name:	batl_MaximumAssetDispositionsOrSwapTerminationsInFiscalYearBeforeDirectReductionInBorrowingBase
Namespace Prefix:	batl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Maximum uncontested accounts payable or accrued expenses, liabilities or other obligations from remaining outstanding for longer than 90 days

+ References

No definition available.

+ Details

Name:	batl_MaximumUncontestedAccountsPayableOrAccruedExpensesLiabilitiesOrOtherObligationsFromRemainingOutstandingForLongerThan90Days
Namespace Prefix:	batl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum mortgaged total value of proved Borrowing Base Properties

+ References

No definition available.

+ Details

Name:	batl_MinimumMortgagedTotalValueOfProvedBorrowingBaseProperties
Namespace Prefix:	batl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Threshold of asset dispositions or swap terminations which need prior consent from lenders.

+ References

No definition available.

+ Details

Name:	batl_ThresholdOfAssetDispositionsOrSwapTerminationsWhichNeedPriorConsentFromLenders
Namespace Prefix:	batl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Threshold percentage of the borrowing base of asset dispositions or swap terminations which require prior consent from lenders

+ References

No definition available.

+ Details

Name:	batl_ThresholdPercentageOfBorrowingBaseOfAssetDispositionsOrSwapTerminationsWhichRequirePriorConsentFromLenders
Namespace Prefix:	batl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Identification of whether the entity has been in compliance with any credit facility debt covenants during the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=batl_SeniorRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=batl_SuccessorSeniorRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=batl_FourthAmendmentToSeniorCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=batl_ThirdAmendmentToSeniorCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DEBT - Senior Facility (Details) $ in Thousands			1 Months Ended	2 Months Ended	6 Months Ended
DEBT - Senior Facility (Details) $ in Thousands	Oct. 29, 2020 USD ($)	Oct. 18, 2019	Dec. 31, 2019 item	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 01, 2021 USD ($)	Jun. 01, 2021 USD ($)	May 10, 2021 USD ($)	Dec. 31, 2020 USD ($)	Nov. 01, 2020 USD ($)	Oct. 08, 2019 USD ($)
Current and long-term debt
Debt				$ 165,209	$ 165,209				$ 160,209
Covenant compliance					As of June 30, 2021, after giving effect to the Third Amendment, discussed below, the Company was in compliance with the financial covenants under the Senior Credit Agreement.
Cash and cash equivalents				1,458	$ 1,458				4,295
Senior revolving credit facility
Current and long-term debt
Debt				$ 163,000	$ 163,000				$ 158,000
Maximum borrowing capacity											$ 750,000,000
Current borrowing capacity							$ 185,000
Amount available for issuance of letters of credit	$ 25,000
Number of interim unscheduled redeterminations of borrowing base to which the company and lender each have the right \| item			1
Number of consecutive semi-annual redeterminations between which the company and the lenders each have the right to one interim unscheduled redetermination of borrowing base \| item			2
Minimum mortgaged total value of proved Borrowing Base Properties	90.00%			85.00%	85.00%
Threshold of Total Net Indebtedness Leverage Ratio					3.50
Amount outstanding				$ 163,000	$ 163,000
Letters of credit outstanding				1,900	1,900
Borrowing capacity available				$ 20,100	$ 20,100
Senior revolving credit facility \| ABR-based \| Minimum
Current and long-term debt
Applicable margin (as a percent)				2.00%
Senior revolving credit facility \| ABR-based \| Maximum
Current and long-term debt
Applicable margin (as a percent)				3.00%
Senior revolving credit facility \| LIBOR \| Minimum
Current and long-term debt
Applicable margin (as a percent)				3.00%
Senior revolving credit facility \| LIBOR \| Maximum
Current and long-term debt
Variable rate percentage		0.50%
Applicable margin (as a percent)				4.00%
Successor Senior revolving credit facility \| Minimum
Current and long-term debt
Current ratio					1.00
Fourth Amendment to the Senior Credit Agreement
Current and long-term debt
Current borrowing capacity				$ 185,000	$ 185,000		$ 185,000
Minimum mortgaged total value of proved Borrowing Base Properties								95.00%
Maximum asset dispositions or swap terminations in fiscal year before direct reduction in the borrowing base								$ 1,000
Threshold of asset dispositions or swap terminations which need prior consent from lenders								$ 7,500
Threshold percentage of the borrowing base of asset dispositions or swap terminations which require prior consent from lenders								3.50%
Fourth Amendment to the Senior Credit Agreement \| ABR-based \| Minimum
Current and long-term debt
Applicable margin (as a percent)				2.00%
Fourth Amendment to the Senior Credit Agreement \| ABR-based \| Maximum
Current and long-term debt
Applicable margin (as a percent)				3.00%
Fourth Amendment to the Senior Credit Agreement \| Euro-dollar based \| Minimum
Current and long-term debt
Applicable margin (as a percent)				3.00%
Fourth Amendment to the Senior Credit Agreement \| Euro-dollar based \| Maximum
Current and long-term debt
Applicable margin (as a percent)				4.00%
Third Amendment to the Senior Credit Agreement
Current and long-term debt
Current borrowing capacity										$ 190,000
Amount available for issuance of letters of credit	$ 25,000
Minimum mortgaged total value of proved Borrowing Base Properties				90.00%	90.00%
Maximum uncontested accounts payable or accrued expenses, liabilities or other obligations from remaining outstanding for longer than 90 days	$ 3,000
Third Amendment to the Senior Credit Agreement \| Minimum
Current and long-term debt
Debt covenant, commodity hedging agreements, volume percentage	65.00%
Plan \| Fourth Amendment to the Senior Credit Agreement
Current and long-term debt
Current borrowing capacity						$ 175,000