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Derivative Financial Instruments - Schedule of Location and Amounts and Derivative Instruments Gains and Losses (Details) - Marketwise, LLC - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |  |  |
Total | $ 2,120 | $ (1,124) | $ 1,726 | $ (997) |  |  |
Other Income |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Total |  |  |  |  | $ (3,069) | $ (478) | $ (217)
Other Income | Phantom Interests in Net Income |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Total | 394 | (1,124) | 0 | (997) |  |  |
General and administrative | Phantom Interests in Net Income |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Total | 2,388 | 0 | 2,388 | 0 |  |  |
General and administrative | Option |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Total | $ (662) | $ 0 | $ (662) | $ 0 |  |  |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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