Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Mar. 04, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-39405
Entity Registrant Name	MarketWise, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	87-1767914
Entity Address, Address Line One	1125 N. Charles Street
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 411.9
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0001805651
Common Stock - Class A
Document 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
Entity Common Stock, Shares Outstanding		28,518,135
Warrants
Document Information [Line Items]
Title of 12(b) Security	Warrants to purchase Class A common stock
Trading Symbol	MKTWW
Security Exchange Name	NASDAQ
Common Stock - Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		291,092,303