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Warrants - Schedule Of The Warrants Outstanding (Detail)	Sep. 30, 2023 shares
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Outstanding	43,848,750
Public Warrants [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Outstanding	31,625,000
Private Warrants [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Outstanding	12,223,750

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

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

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=btm_PublicWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=btm_PrivateWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: