Nominal volume used to calculate payments on a derivative instrument.

No definition available.

Name:	batl_DerivativeNonmonetaryNotionalAmountsVolume
Namespace Prefix:	batl_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cash inflows for termination of derivative contract.

+ References

No definition available.

+ Details

Name:	batl_ProceedsFromTerminationOfDerivativeContract
Namespace Prefix:	batl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Volume of derivative terminated

+ References

No definition available.

+ Details

Name:	batl_VolumeOfDerivativeTerminated
Namespace Prefix:	batl_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeCapPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFloorPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
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

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

- Definition

Indicates designation of financial information when substantially all business or separately identifiable line of business transfers from one entity to another entity. Acceptable values are "Predecessor" and "Successor".

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 45
-Paragraph 27
-URI http://asc.fasb.org/extlink&oid=116635682&loc=SL2890601-112764

+ Details

Name:	us-gaap_FinancialDesignationPredecessorAndSuccessorFixedList
Namespace Prefix:	us-gaap_
Data Type:	us-types:financialDesignationType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_IncomeStatementLocationAxis=batl_NetGainLossOnDerivativeContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=srt_CrudeOilMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_PutOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=batl_CollarsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DERIVATIVE AND HEDGING ACTIVITIES - Narratives - (Details) $ in Millions	1 Months Ended		2 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2020 USD ($) $ / bbl bbl	Oct. 31, 2019	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020 USD ($)	Jun. 30, 2019	Dec. 31, 2019
Derivative and hedging activities
Financial Designation, Predecessor and Successor [Fixed List]		Successor	Successor	Successor	Predecessor	Successor	Predecessor	Successor
Net gain (loss) on derivative contracts
Derivative and hedging activities
Proceeds from termination of derivative contract \| $						$ 16.3
Subsequent event
Derivative and hedging activities
Proceeds from termination of derivative contract \| $	$ 3.2
Volume of derivative terminated \| bbl	782,000
Subsequent event \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	782,000
Subsequent event \| Put options \| Crude oil
Derivative and hedging activities
Floors (in dollars per Bbl's	42.10
Subsequent event \| Collars \| Crude oil
Derivative and hedging activities
Floors (in dollars per Bbl's	42.10
Ceilings (in dollars per Bbl's)	49.02