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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
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