XML 75 R66.htm IDEA: XBRL DOCUMENT
v3.21.2

Fair Value Measurements - Schedule of changes in the fair value of warrant liabilities (Detail) - USD ($) |  | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 29, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Change in fair value of warrant liabilities |  |  | $ 11,989,334 | $ 21,553,334 |  |
Rocket Lab USA, Inc. |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 3,899,000 | $ 1,284,000 | $ 1,197,000
Cost of warrants vesting during the period |  |  |  | 352,000 | 198,000 |
Change in fair value included in earnings |  |  |  | 5,126,000 | 2,417,000 | 87,000
Ending balance |  |  | 3,899,000 | 9,377,000 | 3,899,000 | $ 1,284,000
Private Placement [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  |  |  |
January 1, 2021 |  |  |  | 8,456,000 |  |
Change in fair value of warrant liabilities |  |  |  | 7,420,000 |  |
Ending balance |  |  |  | 15,876,000 |  |
Private Placement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 8,456,000 |  |
Initial measurement | $ 4,373,333 |  |  |  |  |
Change in fair value included in earnings |  | 266,667 | 3,816,000 |  |  |
Ending balance |  | 4,640,000 | 8,456,000 |  | 8,456,000 |
Warrant Liabilities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  |  |  |
January 1, 2021 |  |  |  | 24,562,667 |  |
Change in fair value of warrant liabilities |  |  |  | 21,553,334 |  |
Ending balance |  |  |  | 46,116,001 |  |
Warrant Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Initial measurement | 12,573,333 |  |  |  |  |
Change in fair value included in earnings |  | 766,667 | 11,222,667 |  |  |
Ending balance |  | 13,340,000 |  |  |  |
Warrant Liabilities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 24,562,667 |  |
Ending balance |  |  | 24,562,667 |  | 24,562,667 |
Public [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  |  |  |
January 1, 2021 |  |  |  | 16,106,667 |  |
Change in fair value of warrant liabilities |  |  |  | 14,133,334 |  |
Ending balance |  |  |  | 30,240,001 |  |
Public [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | $ 16,106,667 |  |
Initial measurement | $ 8,200,000 |  |  |  |  |
Change in fair value included in earnings |  | 50,000 | 7,406,667 |  |  |
Ending balance |  | $ 8,700,000 | $ 16,106,667 |  | $ 16,106,667 |

X
- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Cost of warrants Vesting + References No definition available. + Details
Name: | rklb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityCostOfWarrantsVesting
Namespace Prefix: | rklb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value measurement with unobservable inputs reconciliations recurring basis liability initial fair value of warrant. + References No definition available. + Details
Name: | rklb_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityInitialFairValueOfWarrant
Namespace Prefix: | rklb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
Name: | us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
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 No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=rklb_RocketLabUsaIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
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_SubsidiarySaleOfStockAxis=us-gaap_WarrantMember
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_SubsidiarySaleOfStockAxis=rklb_PublicMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |