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Segments - Summary of Information by Reportable Segment (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Sales Information [Line Items] |  |  |  |
Cost of revenues | $ 25,598 | $ 14,632 | $ 46,977 | $ 49,475
Gross profit | 3,874 | (5,879) | (11,817) | (1,076)
Rocket Lab USA, Inc. | Launch Services [Member] |  |  |  |
Sales Information [Line Items] |  |  |  |
Revenues | 24,080 | 8,460 | 33,085 | 48,399
Cost of revenues | 23,695 | 14,508 | 45,872 | 49,475
Gross profit | 385 | (6,048) | (12,787) | $ (1,076)
Rocket Lab USA, Inc. | Space Systems [Member] |  |  |  |
Sales Information [Line Items] |  |  |  |
Revenues | 5,392 | 293 | 2,075 |
Cost of revenues | 1,903 | 124 | 1,105 |
Gross profit | $ 3,489 | $ 169 | $ 970 |

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