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Variable Interest Entities (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]      
Current assets $ 635,761 $ 1,190,526  
Total Assets 414,904,338 415,400,119  
Current liabilities 3,057,810 143,016  
Total liabilities 68,045,210 68,434,126  
Marketwise, LLC      
Variable Interest Entity [Line Items]      
Current assets 330,610,000 180,637,000 $ 205,700,000
Total Assets 491,175,000 284,813,000 276,205,000
Current liabilities 422,572,000 345,538,000 254,431,000
Total liabilities 2,050,484,000 1,205,423,000 544,269,000
Variable Interest Entity, Primary Beneficiary | Marketwise, LLC      
Variable Interest Entity [Line Items]      
Current assets 3,759,000 3,787,000 4,066,000
Noncurrent assets 8,000 22,000 124,000
Total Assets 3,767,000 3,809,000 4,190,000
Current liabilities 3,109,000 3,265,000 2,672,000
Noncurrent liabilities 0 0 1,898,000
Total liabilities $ 3,109,000 $ 3,265,000 $ 4,570,000