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Loan and Security Agreement - Additional Information (Detail) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) installments $ / shares shares | Jun. 10, 2021 USD ($) | Dec. 23, 2020 USD ($) $ / shares shares | Dec. 31, 2016 $ / shares shares
Shares Issued And Outstanding [Line Items] |  |  |  |  |
Revolving line commitment fee | $ 1,000 |  |  |  |
Rocket Lab USA, Inc. |  |  |  |  |
Shares Issued And Outstanding [Line Items] |  |  |  |  |
Loan and security agreement, maximum amount |  |  | $ 100,000 | $ 35,000 |
Warrants issued | shares |  |  |  | 13,432 |
Warrants exercise price | $ / shares |  |  |  | $ 11.62 |
Loan agreement maturity date |  | Dec. 23, 2022 |  |  |
Revolving line commitment fee |  | $ 105 |  |  |
Unused revolving line facility fee, percentage |  | 0.20% |  |  |
Minimum adjusted quick ratio |  | 0.85 |  |  |
Available line of credit |  | $ 35,000 |  |  |
Rocket Lab USA, Inc. | Revolving Credit Facility [Member] |  |  |  |  |
Shares Issued And Outstanding [Line Items] |  |  |  |  |
Interest rate at event of default |  | 5.00% |  |  |
Rocket Lab USA, Inc. | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |
Shares Issued And Outstanding [Line Items] |  |  |  |  |
Floating interest rate above prime rate |  | 2.00% |  |  |
Rocket Lab USA, Inc. | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Shares Issued And Outstanding [Line Items] |  |  |  |  |
Floating interest rate above prime rate |  | 5.25% |  |  |
Rocket Lab USA, Inc. | Term Loans [Member] |  |  |  |  |
Shares Issued And Outstanding [Line Items] |  |  |  |  |
Loan agreement description |  | The Company can request an advance from the Term Loan from December 23, 2020 through September 30, 2021 in an aggregate principal amount not to exceed the lesser of (i) $15,000, or (ii) measured at the time of each advance request, the difference of $35,000 less the aggregate outstanding amount of advances received under the revolving line. The aggregate outstanding principal amount of the Term Loan advances shall not exceed $15,000. |  |  |
Number of equal installments | installments |  | 36 |  |  |
Amount of minimum increment to repay term loan |  | $ 1,000 |  |  |
Rocket Lab USA, Inc. | Common Stock [Member] |  |  |  |  |
Shares Issued And Outstanding [Line Items] |  |  |  |  |
Warrants issued | shares |  | 13,432 |  | 13,432 | 51,184
Warrants exercise price | $ / shares |  | $ 11.62 |  | $ 11.62 | $ 0.82

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