COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	6 Months Ended
Jun. 30, 2021 USD ($) contract
Purchase commitments related to equipment
Remaining period in 2021 \| $	$ 4.9
2022 \| $	$ 4.8
Gathering, transportation and sales \| West Texas
Purchase commitments related to equipment
Number of long-term crude oil sales contracts to which the entity is committed \| contract	2
Number of long-term natural gas sales contracts to which the entity is committed \| contract	12
Gathering, transportation and sales \| West Texas \| Minimum
Purchase commitments related to equipment
Period of commitment for production from the date of first production	1 year
Gathering, transportation and sales \| West Texas \| Maximum
Purchase commitments related to equipment
Period of commitment for production from the date of first production	20 years

Represents the number of long-term crude oil sales contracts to which the entity is committed.

No definition available.

Name:	batl_ContractualObligationNumberOfLongTermCrudeOilSalesContracts
Namespace Prefix:	batl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of long-term natural gas sales contracts to which the entity is committed.

+ References

No definition available.

+ Details

Name:	batl_ContractualObligationNumberOfLongTermNaturalGasSalesContracts
Namespace Prefix:	batl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the period of commitment for production from the date of first production.

+ References

No definition available.

+ Details

Name:	batl_ContractualObligationPeriodOfCommitmentForProductionFromTheDateOfFirstProduction
Namespace Prefix:	batl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Amount of purchase arrangement to be paid in remainder of current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment.

+ References

No definition available.

+ Details

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

- Details

Name:	batl_ContractualObligationAxis=batl_GatheringTransportationAndSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=batl_WestTexasMember
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: