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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 01, 2022 | Mar. 31, 2022 | Mar. 31, 2021 | Jul. 21, 2021
Significant Accounting Policies [Line Items] |  |  |  |
Gain on derivative warrant liabilities |  | $ 6,700 |  |
Income tax expense |  | $ 1,522 | $ 0 |
Marketwise, LLC |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Ownership interest, controlling |  | 7.20% |  |
Ownership interest, noncontrolling |  | 92.80% |  |
Common Stock - Class B |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Vesting period |  | 8 years |  |
Exercise of put option, period from issuance date |  | 25 months |  |
Employee Stock Purchase Plan |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Common stock reserved for issuance (in shares) | 6,409,000 |  |  |
Offering period | 6 months |  |  |
Purchase price of common stock, percent of fair market value | 85.00% |  |  |
2021 Incentive Award Plan |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  | 32,045,000
Maximum number of shares that may be issued (in shares) |  |  |  | 32,045,000

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