XML 54 R41.htm IDEA: XBRL DOCUMENT v3.25.2

Fair Value Measurements (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2025	Mar. 30, 2025	Mar. 05, 2025	Feb. 14, 2025	Aug. 13, 2024	Aug. 12, 2024	Mar. 30, 2024	Dec. 31, 2022
Fair Value Measurements [Line Items]
Shared-based termination liability						$ 6,349,000
Private Placement Warrant Liability [Member]
Fair Value Measurements [Line Items]
Number of warrants exchanged (in Shares)									250,000	250,000
Number of securities called by warrants or rights (in Shares)									250,000	250,000
Exercise price (in Dollars per share)									$ 10	$ 10
Remeasurement of warrant liability	$ (499,000)		$ 112,000		(13,001,000)
Convertible preferred stock	245,000		245,000		133,000
Convertible Preferred Stock Warrant Liability [Member]
Fair Value Measurements [Line Items]
Remeasurement of warrant liability		(73,000)		(97,000)	(6,000)	(127,000)
Convertible preferred stock						203,000						$ 200,000
Public placement warrant liability					10,000.00	100,000
Public Placement Warrant Liability [Member]
Fair Value Measurements [Line Items]
Exercise price (in Dollars per share)											$ 230
Remeasurement of warrant liability	(78,000)		(262,000)		(24,907,000)
Convertible preferred stock	5,000		5,000		267,000
Convertible Notes Payable [Member] | Nonrelated Party [Member]
Fair Value Measurements [Line Items]
Convertible notes outstanding
Public placement warrant liability					31,700,000	300,000
Convertible Notes Payable [Member] | Related Party [Member]
Fair Value Measurements [Line Items]
Convertible notes outstanding
Public placement warrant liability					3,800,000	100,000
Share-Based Termination Liability [Member]
Fair Value Measurements [Line Items]
Convertible notes outstanding		7,661,000		7,661,000		6,349,000							$ 6,163,000
Public placement warrant liability					1,000,000	300,000
Warrant [Member] | Private Placement Warrant Liability [Member]
Fair Value Measurements [Line Items]
Convertible notes outstanding	245,000		245,000		133,000			$ 744,000
Public placement warrant liability					13,000,000	0
Warrant [Member] | Convertible Preferred Stock Warrant Liability [Member]
Fair Value Measurements [Line Items]
Convertible notes outstanding		$ 106,000		$ 106,000		203,000							$ 179,000	$ 330,000
Warrant [Member] | Public Placement Warrant Liability [Member]
Fair Value Measurements [Line Items]
Convertible notes outstanding	$ 5,000		$ 5,000		267,000			$ 83,000
Public placement warrant liability					24,900,000	0
Warrant [Member] | Nonrelated Party [Member]
Fair Value Measurements [Line Items]
Convertible notes outstanding						15,604,000
Warrant [Member] | Related Party [Member]
Fair Value Measurements [Line Items]
Convertible notes outstanding						$ 2,133,000

X

- Definition

Class Of Warrant Or Right, Number Of Warrants Exchanged

+ References

No definition available.

+ Details

Name:	bslk_ClassOfWarrantOrRightNumberOfWarrantsExchanged
Namespace Prefix:	bslk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	bslk_FairValueMeasurementsDetailsLineItems
Namespace Prefix:	bslk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-Based Termination Liability, Current

+ References

No definition available.

+ Details

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

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

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

X

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair value of asset after deduction of liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_FairValueNetAssetLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_ConvertibleNotesPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_NonrelatedPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_RelatedPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=bslk_ShareBasedTerminationLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_WarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: