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Fair Value Measurements - Additional Information (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair value assets transfer between levels	$ 0	$ 0

X

- Definition

Fair value assets transfers between level one level two or level three amount.

+ References

No definition available.

+ Details

Name:	bold_FairValueAssetsTransfersBetweenLevelOneLevelTwoOrLevelThreeAmount
Namespace Prefix:	bold_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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