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Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 21, 2021 USD ($) tradingDay $ / shares shares	Jul. 21, 2021 USD ($) shares	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Significant Accounting Policies [Line Items]
Number of reportable segments | segment					1
Common stock reserved for issuance (in shares)	32,045,000	32,045,000
Maximum number of shares that may be issued (in shares)	32,045,000	32,045,000
Sponsor Earn Out Shares (in shares)	3,051,000	3,051,000
Earnout period	4 years
Earnout fair value | $	$ 26,000	$ 26,000
Gain on derivative warrant liabilities | $		9,900
Income tax provision | $		$ 3,100	$ 3,085	$ 0	$ 3,085	$ 0
Marketwise, LLC
Significant Accounting Policies [Line Items]
Ownership percentage	7.90%	7.90%
Noncontrolling interest ownership percentage	92.10%	92.10%
Earnout period one
Significant Accounting Policies [Line Items]
Earnout shares percentage released	50.00%
VWAP threshold (in USD per share) | $ / shares	$ 12.00
VWAP trading days threshold | tradingDay	20
VWAP consecutive trading days threshold | tradingDay	30
Earnout period two
Significant Accounting Policies [Line Items]
Earnout shares percentage released	50.00%
VWAP threshold (in USD per share) | $ / shares	$ 14.00
VWAP trading days threshold | tradingDay	20
VWAP consecutive trading days threshold | tradingDay	30
Sponsor
Significant Accounting Policies [Line Items]
Sponsor Earn Out Shares (in shares)	3,051,000	3,051,000
Management members
Significant Accounting Policies [Line Items]
Sponsor Earn Out Shares (in shares)	2,000,000	2,000,000
Common Stock - Class B
Significant Accounting Policies [Line Items]
Vesting period					8 years
Exercise of put option, period from issuance date					25 months

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