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Warrants - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 10, 2021 | Aug. 25, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 22, 2021 | Jul. 12, 2021 | Dec. 23, 2020 | Dec. 31, 2016
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Exchange of preferred stock warrants for common stock warrants |  |  | $ 2,975,000 | $ 496,000 |  |  |  |
Fair value of warrants |  |  |  | 2,433,000 |  |  |  |
Warrants assumed as part of Business Combination |  |  | $ 58,227,000 | $ 0 |  | $ 6,514,000 |  |
Fair value per share of common stock |  |  | $ 0 | $ 1.41 |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Class of warrant or right number of securities called by warrants or rights |  |  |  |  |  |  |  | 118,591
Warrants exercise price |  |  |  |  |  |  |  | $ 0.25
Warrants to purchase vested |  |  |  | 86,973 |  |  |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Class of warrant or right number of securities called by warrants or rights |  |  |  |  |  |  |  | 699,388
Warrants exercise price |  |  |  |  |  |  |  | $ 2.10
Warrants to purchase vested |  |  |  | 512,885 |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Warrants for Redemption Description |  |  | Redemption of warrants when the price per common share equals or exceeds $18.00. Once the warrants become exercisable, the Company may redeem the outstanding warrants (except as described with respect to the Private Warrants): •in whole and not in part; •at a price of $0.01 per warrant; •upon a minimum of 30 days’ prior written notice of redemption to each warrant holder; and •if, and only if, the closing price of the common shares equals or exceeds $18.00 per share (as adjusted) for any 20 trading days within a 30-trading day period ending three trading days before the Company sends the notice of redemption to the warrant holders. |  |  |  |  |
Fair value per share of common stock |  |  | $ 18.00 |  |  |  |  |
Legacy Rocket Lab common stock warrants [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Class of warrant or right number of securities called by warrants or rights | 585,399 |  |  |  |  |  |  |
Class of warrants and rights issued during the period | 575,840 |  |  |  |  |  |  |
Legacy Rocket Lab preferred stock warrants [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Warrants exercise price | $ 0.20 |  |  |  |  |  |  |
Exchange of preferred stock warrants for common stock warrants |  |  | $ 1,466,000 |  |  |  |  |
Class of warrants and rights issued during the period | 303,047 |  |  |  |  |  |  |
Class of warrant or right, outstanding | 305,981 |  |  |  |  |  |  |
Warrants assumed as part of Business Combination | $ 2,975,000 |  |  |  |  |  |  |
Public Warrants [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Warrants exercise price |  | $ 2.96 | $ 3.58 |  | $ 0.2843 |  |  |
Warrants assumed as part of Business Combination |  | $ 48,149,000 |  |  |  |  |  |
Number of securities called by each warrant or right |  | 0 |  |  |  |  |  |
Class of warrant or right, date from which warrants or rights exercisable |  | Sep. 29, 2021 |  |  |  |  |  |
Warrants and rights outstanding, term |  | 5 years |  |  |  |  |  |
Public and Private Warrants [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Warrants exercise price |  |  |  |  | 0.2843 |  |  |
Redemption Price |  |  |  |  | 0.10 |  |  |
Private Placement Warrants [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Warrants assumed as part of Business Combination |  |  | $ 58,227,000 |  |  |  |  |
Private Placement [Member] | Common Class A [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Warrants for Redemption Description |  |  | Redemption of warrants when the price per common share equals or exceeds $10.00. Once the warrants become exercisable, the Company may redeem the outstanding warrants (except as described with respect to the Private Warrants): •in whole and not in part: •at a price of $0.10 per warrant upon a minimum of 30 days’ prior written notice of redemption provided that holders will be able to exercise their warrants on a cashless basis prior to redemption and receive that number of shares set forth in the warrant agreement determined based on the redemption date and the fair market value of the common shares; •if, and only if, the closing price of the common shares equals or exceeds $10.00 per share (as adjusted) for any 20 trading days within the 30-trading day period ending three trading days before the Company sends the notice of redemption to the warrant holders; and •if the closing price of the common shares for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sends the notice of redemption to the warrant holders is less than $18.00 per share (as adjusted), the Private Warrants must also be concurrently called for redemption on the same terms as the outstanding Public Warrants, as described above. |  |  |  |  |
Warrant exercise price per share |  |  | $ 10.00 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Class of warrant or right number of securities called by warrants or rights |  |  |  | 121,689 |  |  | 121,689 | 463,710
Warrants exercise price |  |  |  | $ 1.28 | $ 11.50 |  | $ 1.28 | $ 0.09
Fair value of warrants |  |  |  |  |  |  |  | $ 23,000
Class of warrants and rights issued during the period | 305,981 |  |  |  |  |  |  |
Common Stock [Member] | Public Warrants [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Warrants assumed as part of Business Combination |  | $ 10,666,666,000 |  |  |  |  |  |
Common Stock [Member] | Private Placement Warrants [Member] |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Warrants exercise price |  |  | $ 11.50 |  |  |  |  |
Warrants assumed as part of Business Combination |  | $ 5,600,000,000 |  |  |  |  |  |

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