| Document and Entity Information Document | Nov. 10, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 10, 2021 |
| Entity Registrant Name | MarketWise, Inc. |
| Entity Central Index Key | 0001805651 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39405 |
| Entity Tax Identification Number | 87-1767914 |
| Entity Address, Address Line One | 1125 N. Charles St. |
| Entity Address, City or Town | Baltimore, |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 21201 |
| City Area Code | (888) |
| Local Phone Number | 261-2693 |
| Entity Information, Former Legal or Registered Name | N/A |
| 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 |
| Common Class A [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Class A common stock, $0.0001 par value per share |
| Trading Symbol | MKTW |
| Security Exchange Name | NASDAQ |
| Warrant | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Warrants to purchase Class A common stock |
| Trading Symbol | MKTWW |
| Security Exchange Name | NASDAQ |
