COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) contract
Drilling rig commitments
Obligations under drilling rig commitments
Non-cancelable termination penalties	$ 1.0
Drilling rig commitments	1.2
Purchase Commitments
Purchase commitments related to equipment
2020	$ 1.6
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	3
Number of long-term natural gas sales contracts to which the entity is committed \| contract	14
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
Active Drilling Rig Commitment
Obligations under rig termination and stacking fees commitments
2020	$ 1.2

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

Represents the obligation amount of commitment related to drilling rigs. There are two separate trigger dates that must be met.

+ References

No definition available.

+ Details

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

- Definition

Amount of termination penalties on non-cancelable purchase commitments in lieu of paying the remaining drilling commitments.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Minimum amount of other commitment maturing in the next fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ 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

- Details

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

- Details

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

- 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:

- Details

Name:	us-gaap_OtherCommitmentsAxis=batl_ActiveDrillingRigCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: