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Revenue Recognition - Summary of Contract Balances (Details) - Marketwise, LLC - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Contract with Customer, Contract Asset, Contract Liability, and Receivable [Line Items] |  |  |  |
Accounts receivable | $ 8,965 | $ 12,398 | $ 7,332 | $ 818
Obligations for refunds | 4,781 | 3,448 | 2,214 | 3,507
Deferred revenue – current | 319,894 | 274,819 | 190,778 | 171,273
Deferred revenue – non-current | $ 382,797 | $ 254,481 | $ 160,907 | $ 142,229

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