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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
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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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