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Inventories - Schedule of Inventory (Detail) - Rocket Lab USA, Inc. - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Line Items]
Raw materials	$ 13,962	$ 14,023	$ 8,523
Work in process	17,554	12,112	5,635
Total inventories — net	$ 31,516	$ 26,135	$ 14,157

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