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FINANCIAL STATEMENT PRESENTATION - Employee Retention Credit (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
FINANCIAL STATEMENT PRESENTATION
Employee retention credit	$ 0.7
General and administrative
FINANCIAL STATEMENT PRESENTATION
Employee retention credit	0.5
Operating Lease
FINANCIAL STATEMENT PRESENTATION
Employee retention credit	$ 0.2

X

- Definition

Amount of employee retention credit under the CARES Act.

+ References

No definition available.

+ Details

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Namespace Prefix:	batl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

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

X

- Details

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

X

- Details

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