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FINANCIAL STATEMENT PRESENTATION - Change in Estimate (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Change in Estimate
Reduction of discretionary cash incentives	$ 1.6

X

- Definition

Reduction of discretionary cash incentives

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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