| Document and Entity Information | Aug. 24, 2021 |
| Document Information Line Items | |
| Document Type | 8-K |
| Document Period End Date | Aug. 24, 2021 |
| Entity Registrant Name | Vector Acquisition Corp |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39560 |
| Entity Tax Identification Number | 80-0947107 |
| Entity Address, Address Line One | 3881 McGowen Street |
| Entity Address, City or Town | Long Beach |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90808 |
| City Area Code | 714 |
| Local Phone Number | 465-5737 |
| Entity Information, Former Legal or Registered Name | Vector Acquisition Corporation |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Current Fiscal Year End Date | --12-31 |
| Amendment Flag | false |
| Entity Central Index Key | 0001819994 |
| Former Address [Member] | |
| Document Information Line Items | |
| Entity Address, Address Line One | One Market Street |
| Entity Address, Address Line Two | Steuart Tower, 23rd Floor |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94105 |
| Common stock, $0.0001 par value per share [Member] | |
| Document Information Line Items | |
| Title of 12(b) Security | Common stock, $0.0001 par value per share |
| Trading Symbol | RKLB |
| Security Exchange Name | NASDAQ |
| Warrant Liabilities [Member] | |
| Document Information Line Items | |
| Title of 12(b) Security | Redeemable warrants, each whole warrant exercisable for one share of common stock, $0.0001 par value |
| Trading Symbol | RKLBW |
| Security Exchange Name | NASDAQ |
