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Business Combinations - Summary of Identifiable Intangible Assets Acquired and Related Expected Lives for the Finite-Lived Intangible Assets (Detail) - Sinclair Interplanetary [Member] - Rocket Lab USA, Inc.
$ in Thousands
Apr. 28, 2020
USD ($)
Business Acquisition [Line Items]  
Total identifiable intangible assets acquired $ 10,250
Developed Technology Rights [Member]  
Business Acquisition [Line Items]  
Estimated Life in Years 7 years
Total identifiable intangible assets acquired $ 9,200
In-process Technology [Member]  
Business Acquisition [Line Items]  
Total identifiable intangible assets acquired $ 100
Customer Relationships [Member]  
Business Acquisition [Line Items]  
Estimated Life in Years 3 years
Total identifiable intangible assets acquired $ 600
Backlog [Member]  
Business Acquisition [Line Items]  
Estimated Life in Years 8 months 12 days
Total identifiable intangible assets acquired $ 50
Trademark and Trade names [Member]  
Business Acquisition [Line Items]  
Estimated Life in Years 3 years
Total identifiable intangible assets acquired $ 100
Noncompete Agreement [Member]  
Business Acquisition [Line Items]  
Estimated Life in Years 4 years
Total identifiable intangible assets acquired $ 200