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Fair Value Of Financial Instruments - Summary of Warrant Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Beginning balance	$ 3,899	$ 1,284
Cost of warrants vesting during the period	352	198
Change in fair value included in earnings	5,238	2,417
Exercise of warrants to purchase Legacy Rocket Lab Series C and D preferred stock	(6,514)
Exchange of warrants to purchase Legacy Rocket Lab Series B preferred stock to common stock warrants	(2,975)
Ending balance		$ 3,899

X

- Definition

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Cost of warrants Vesting

+ References

No definition available.

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X

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis liability exercise of warrants to purchase.

+ References

No definition available.

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X

- Definition

FairValue measurement with unobservable inputs reconciliation recurring basis liability exchange of warrants to purchase.

+ References

No definition available.

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- References

No definition available.

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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

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- 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

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