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Description of Business - Additional Information (Detail) - USD ($) | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Accrued expenses | $ 217,395 | $ 2,172,617 |  |  |
Rocket Lab USA, Inc. |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Trade payables |  | (3,384,000) | $ 598,000 | $ (1,603,000) | $ 2,989,000
Accrued expenses |  | 2,849,000 | $ 152,000 | $ 4,104,000 | 394,000
Gross proceeds raised from business combination and PIPE investment and payments from customers |  | $ 777,000,000 |  |  |
Rocket Lab USA, Inc. | Revision of Prior Period, Error Correction, Adjustment [Member] |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Prior period adjustment description |  |  |  | Subsequent to the issuance of our consolidated financial statements for the years ending December 31, 2020 and 2019, we concluded that $5,004 of cash payments made during 2020 for capital expenditures that were accrued during 2019 were incorrectly presented in the Consolidated Statement of Cash Flows. During 2019, $5,004 of accrued capital expenditures were presented as an investing cash outflow, and when these payments were made during 2020, these payments were not presented as an investing cash outflow. Further, $1,285 of cash payments made during 2019 for capital expenditures that were accrued during 2018 were incorrectly presented in the Consolidated Statement of Cash Flows and not presented as an investing cash outflow during 2019, resulting in a net effect of $5,004 in 2020 and $3,719 in 2019. The accompanying Consolidated Statement of Cash Flows for the year ended December 31, 2020 and December 31, 2019 have been revised from amounts previously reported to present the payment of accrued capital expenditures in the proper periods in the Consolidated Statement of Cash Flows. We assessed the significance of the misstatements and concluded that they were not material to any periods presented. As a result of these corrections, the Consolidated Statement of Cash Flows for 2019 reflects a decrease in purchases of property, equipment, and software of $3,719 reported within cash used in investing activities and an increase in cash used in operating activities due to adjustments made to the change in trade payables of $2,334 and the change in accrued expenses of $1,387. During 2020, the Consolidated Statement of Cash Flows reflects an increase in purchases of property, equipment, and software reported within cash used in investing activities of $5,004 and a decrease in cash used in operating activities due to adjustments made to the change in trade payables of $3,723 and the change in accrued expenses of $1,281. |
Purchases of property, equipment and software |  |  |  | $ 5,004,000 | (3,719,000)
Trade payables |  |  |  | (3,723,000) | 2,334,000
Accrued expenses |  |  |  | $ (1,281,000) | $ 1,387,000

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- Definition Description of a prior period adjustment to previously issued financial statements, including an adjustment that is a correction of an error. At a minimum, the description may include the nature and reasons for the adjustment and the periods affected by the adjustment, as well as (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustment (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794 + Details
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