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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)