XML 79 R66.htm IDEA: XBRL DOCUMENT
v3.25.2

Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024 | Aug. 12, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Long-term debt, non-current | $ 13,009 | $ 13,186 |  | $ 13,340
Total liabilities | 13,259 | 13,586 |  | 37,629
Convertible notes, current |  |  |  | 15,604
Shared-based termination liability |  |  |  | 6,349
Public Placement Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability | 5 | 267 |  |
Private Placement Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability | 245 | 133 |  |
Convertible Preferred Stock Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability |  |  | $ 200 | 203
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Long-term debt, non-current |  |  |  |
Total liabilities |  |  |  |
Shared-based termination liability |  |  |  |
Fair Value, Inputs, Level 1 [Member] | Public Placement Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability |  |  |  |
Fair Value, Inputs, Level 1 [Member] | Private Placement Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability |  |  |  |
Fair Value, Inputs, Level 1 [Member] | Convertible Preferred Stock Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Long-term debt, non-current | 13,009 | 13,186 |  | 13,340
Total liabilities | 13,009 | 13,186 |  | 13,340
Shared-based termination liability |  |  |  |
Fair Value, Inputs, Level 2 [Member] | Public Placement Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability |  |  |  |
Fair Value, Inputs, Level 2 [Member] | Private Placement Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability |  |  |  |
Fair Value, Inputs, Level 2 [Member] | Convertible Preferred Stock Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability |  |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Long-term debt, non-current |  |  |  |
Total liabilities | 250 | 400 |  | 24,289
Shared-based termination liability |  |  |  | 6,349
Fair Value, Inputs, Level 3 [Member] | Public Placement Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability | 5 | 267 |  |
Fair Value, Inputs, Level 3 [Member] | Private Placement Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability | $ 245 | 133 |  |
Fair Value, Inputs, Level 3 [Member] | Convertible Preferred Stock Warrant Liability [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Public placement warrant liability |  |  |  | 203
Nonrelated Party [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Convertible notes, current |  |  |  | 15,604
Nonrelated Party [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Convertible notes, current |  |  |  |
Nonrelated Party [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Convertible notes, current |  |  |  |
Nonrelated Party [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Convertible notes, current |  |  |  | 15,604
Related Party [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Related party convertible notes, current |  |  |  | 2,133
Related Party [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Related party convertible notes, current |  |  |  |
Related Party [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Related party convertible notes, current |  |  |  |
Related Party [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value Measurements - Schedule of Public Placement Warrant Liability (Details) [Line Items] |  |  |  |
Related party convertible notes, current |  |  |  | $ 2,133

X
- References No definition available. + Details
Name: | bslk_FairValueMeasurementsScheduleofPublicPlacementWarrantLiabilityDetailsLineItems
Namespace Prefix: | bslk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-Based Termination Liability, Fair Value Disclosure + References No definition available. + Details
Name: | bslk_ShareBasedTerminationLiabilityFairValueDisclosure
Namespace Prefix: | bslk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_ConvertibleNotesPayableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + 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 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 10: 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_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term notes classified as other, payable within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_OtherNotesPayableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_PublicPlacementWarrantLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
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: |