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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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