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Organization (Details) $ / shares in Units, $ in Thousands | Jul. 21, 2021 USD ($) $ / shares shares | Sep. 30, 2021 $ / shares shares | Jul. 22, 2021 shares
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Subsidiary, Sale of Stock [Line Items] |  |  |
Recapitalization exchange ratio | 1 |  |
Number of shares called by each warrant | 1 |  |
Recapitalization units exchange ratio, shares (in shares) | 1 |  |
Recapitalization units exchange ratio, warrants (in shares) | 0.5 |  |
Reverse recapitalization, common units issued (in shares) | 28,003,096 |  |
Warrants issued (in shares) | 30,979,993 |  |
PIPE Investors shares subscribed (in shares) | 15,000,000 |  |
Sale of stock price per share (in USD per share) | $ / shares | $ 10.00 |  |
Consideration received | $ | $ 150,000 |  |
Sponsor Earn Out Shares (in shares) | 3,051,000 |  |
Warrants outstanding (in shares) | 30,979,993 |  |
Reverse Recapitalization cash proceeds | $ | $ (113,291) |  |
Proceeds from recapitalization, reclassification of Trust Account | $ | 414,300 |  |
Proceeds from PIPE investment | $ | 150,000 |  |
Payment of non-recurring transaction costs | $ | 48,800 |  |
Settlement of deferred underwriters' discount | $ | 14,500 |  |
Payments to redeeming shareholders | $ | 387,700 |  |
Establishment of derivative warrant liabilities | $ | 45,021 |  |
Establishment of deferred taxes | $ | $ 10,056 |  |
Sponsor |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Sponsor Earn Out Shares (in shares) | 3,051,000 |  |
Private Warrants |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Warrants outstanding (in shares) | 10,280,000 |  |
Ascendant Digital Acquisition Corp Public Shareholders | MarketWise, Inc. |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Ownership percentage | 0.10% |  |
MarketWise Members | MarketWise, Inc. |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Ownership percentage | 91.20% |  |
Ascendant Sponsor LP | MarketWise, Inc. |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Ownership percentage | 3.20% |  |
PIPE Investors | MarketWise, Inc. |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Ownership percentage | 4.70% |  |
Common Stock - Class A |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Common stock, par value (USD per share) | $ / shares | $ 0.0001 | $ 0.0001 |
Common stock, outstanding (in shares) | 15,000,000 | 25,152,469 | 28,003,096
Common Stock - Class A | Ascendant Digital Acquisition Corp. |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Common stock, par value (USD per share) | $ / shares | $ 0.0001 |  |
Common Stock - Class B |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Common stock, par value (USD per share) | $ / shares | $ 0.0001 | $ 0.0001 |
Stock issued during reverse recapitalization (in shares) | 291,092,303 |  |
Common stock, outstanding (in shares) | 291,092,303 | 291,092,303 |

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