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Revenue Recognition - Capitalized Service Contract Costs (Details) - Marketwise, LLC - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Capitalized Contract Cost [Roll Forward]        
Capitalized costs, beginning balance $ 107,236 $ 42,314 $ 35,565 $ 23,259
Sales commissions - additions 43,770 43,273 18,984 15,940
Revenue share fees – additions 62,491 52,193 6,284 8,468
Amortization of capitalized costs (31,920) (30,544) (18,519) (12,102)
Capitalized costs, ending balance $ 181,577 $ 107,236 $ 42,314 $ 35,565