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Derivative Financial Instruments - Narrative (Details) - Marketwise, LLC $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) instrument | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Derivative [Line Items] |  |  |
Cash received upon issuance of derivative instruments | $ | $ 0 | $ 0 | $ 306
Number of derivative instruments outstanding (instrument) | instrument | 1 |  |

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