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Leases (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2024	Aug. 31, 2024
Berkeley Facility Lease [Member]
Leases [Line Items]
Number of shares issued threshold (in Shares)		600,000
Termination liability		$ 4.8
Number of shares issued to settle the share-based termination liability (in Shares)	600,000
Netherlands Lease [Member]
Leases [Line Items]
Termination liability				$ 0.2
Gain (loss) on lease termination			$ 2.0

X

- Definition

Contingent Lease Termination, Number Of Shares Issued Threshold

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Share-Based Termination Liability, Current

+ References

No definition available.

+ Details

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Namespace Prefix:	bslk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Stock Issued During Period, Shares Issued Due To Lease Terminations, Shares

+ References

No definition available.

+ Details

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Namespace Prefix:	bslk_
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Balance Type:	na
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X

- Definition

Amount of gain (loss) on termination of lease before expiration of lease term.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479092/842-20-40-1

+ Details

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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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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: