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FINANCIAL STATEMENT PRESENTATION - Employee Retention Credit (Details) $ in Millions | 9 Months Ended
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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

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- 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

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- 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

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

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