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Business Combinations - Additional Information (Detail) - Rocket Lab USA, Inc. - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 28, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 3,277 |  | $ 3,133 | $ 0
Stock-based compensation expense related to shares issued in conjunction with the acquisition |  | 2,379 | $ 1,923 | 4,218 | $ 3,930
Sinclair Interplanetary [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of outstanding capital stock and voting interest acquired | 100.00% |  |  |  |
Cash consideration transferred | $ 12,340 |  |  |  |
Goodwill | $ 2,895 |  |  |  |
Common stock shares issued to seller upon closing of acquisition | 272,727 |  |  |  |
Contingent earnout shares to be issued | 211,416 |  |  |  |
Business acquisition contingent earnout period | 2 years |  |  |  |
Stock-based compensation expense related to shares issued in conjunction with the acquisition |  | $ 882 | $ 234 | 934 |
Revenue related to acquisition |  |  |  | 2,075 |
Net loss related to acquisition |  |  |  | $ 936 |
Acquisition and integration related costs | $ 1,026 |  |  |  |
Sinclair Interplanetary [Member] | First one year period based on revenue and gross margin [Member] | Minimum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent earnout shares to be issued | 0 |  |  |  |
Sinclair Interplanetary [Member] | First one year period based on revenue and gross margin [Member] | Maximum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent earnout shares to be issued | 105,708 |  |  |  |
Sinclair Interplanetary [Member] | Second one year period based on revenue and gross margin [Member] | Minimum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent earnout shares to be issued | 0 |  |  |  |
Sinclair Interplanetary [Member] | Second one year period based on revenue and gross margin [Member] | Maximum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent earnout shares to be issued | 105,708 |  |  |  |

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