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Net Loss Per Share - Summary of Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - Rocket Lab USA, Inc. - shares | 6 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Preferred Stock [Member] |  |  |  |
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Equity shares | 31,330,513 | 31,330,513 | 31,330,513 | 30,680,373
Preferred Stock Warrants [Member] |  |  |  |
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Equity shares | 124,062 | 124,062 | 124,062 | 124,062
Common Stock Warrants [Member] |  |  |  |
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Equity shares | 64,616 | 51,184 | 64,616 | 51,184
Stock Options [Member] |  |  |  |
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Equity shares | 2,357,382 | 2,945,022 | 2,438,141 | 3,009,360

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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