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Prepaid and Other Current Assets - Schedule of Prepaid and Other Current Assets (Detail) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Prepaid expenses $ 284,625 $ 366,647  
Rocket Lab USA, Inc.      
Prepaid expenses 2,370,000 2,628,000 $ 833,000
Government grant receivables 0 5,870,000 3,475,000
Other current assets 2,555,000 914,000 2,038,000
Total prepaids and other current assets $ 4,925,000 $ 9,412,000 $ 6,346,000