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Business Combinations - Summary of Stockbased Compensation Expense Recognized in Conjunction with the Sinclair Interplanetary Acquisition (Details) - Rocket Lab USA Inc [Member] - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Stockbased Compensation Expense Recognized in Conjunction with Business Acquisition [Line Items] |  |  |  |
Allocated share based compensation | $ 2,379 | $ 1,923 | $ 4,218 | $ 3,930
Sinclair Interplanetary [Member] |  |  |  |
Schedule of Stockbased Compensation Expense Recognized in Conjunction with Business Acquisition [Line Items] |  |  |  |
Allocated share based compensation | 882 | 234 | $ 934 |
Stock Issued in conjunction with the Acquisition [Member] | Sinclair Interplanetary [Member] |  |  |  |
Schedule of Stockbased Compensation Expense Recognized in Conjunction with Business Acquisition [Line Items] |  |  |  |
Allocated share based compensation | 701 | $ 234 |  |
Earnout Share Achievement [Member] | Sinclair Interplanetary [Member] |  |  |  |
Schedule of Stockbased Compensation Expense Recognized in Conjunction with Business Acquisition [Line Items] |  |  |  |
Allocated share based compensation | $ 181 |  |  |

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