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Goodwill and Intangible Assets, Net - Components of Intangible Assets (Detail) - Rocket Lab USA, Inc. - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 15,568 | $ 15,021 | $ 2,588
Accumulated Amortization | (4,879) | (3,672) | (1,259)
Net Carrying Amount | 10,689 | 11,349 | 1,329
In Process Research and Development [Member] |  |  |
Disclosure Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 113 | 110 |
Accumulated Amortization | 0 |  |
Net Carrying Amount | 113 | 110 |
Developed Technology [Member] |  |  |
Disclosure Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 10,414 | 10,090 |
Accumulated Amortization | (1,748) | (973) |
Net Carrying Amount | 8,666 | 9,117 |
Capitalized Software [Member] |  |  |
Disclosure Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 3,758 | 3,541 | 2,259
Accumulated Amortization | (2,683) | (2,379) | (1,118)
Net Carrying Amount | 1,075 | 1,162 | 1,141
Customer Relationships [Member] |  |  |
Disclosure Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 679 | 658 |
Accumulated Amortization | (266) | (148) |
Net Carrying Amount | 413 | 510 |
Non-compete agreement [Member] |  |  |
Disclosure Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 226 | 219 |
Accumulated Amortization | (67) | (37) |
Net Carrying Amount | 159 | 182 |
Capitalized Intellectual Property [Member] |  |  |
Disclosure Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 225 | 199 | 329
Accumulated Amortization | (66) | (51) | (141)
Net Carrying Amount | 159 | 148 | $ 188
Trademark and Trade names [Member] |  |  |
Disclosure Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 153 | 149 |
Accumulated Amortization | (49) | (29) |
Net Carrying Amount | $ 104 | 120 |
Backlog [Member] |  |  |
Disclosure Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 55 |
Accumulated Amortization |  | $ (55) |

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