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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)