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Revenue - Balances Related to Enforceable Contracts (Detail) - Rocket Lab USA, Inc. - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Contract balances |  |  |  |
Accounts receivable | $ 22,355 | $ 2,730 | $ 1,185 |
Contract assets | 843 | 2,045 | 7,064 |
Contract liabilities | $ (31,138) | $ (26,132) | $ (10,211) | $ (11,590)

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