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Supplemental Cash Flow Information (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 10, 2020
Dec. 31, 2017
Reconciliation of Cash and Cash Equivalents and Restricted Cash:              
Cash and cash equivalents $ 416,780   $ 861,754        
Total 416,780 $ 0 861,754 $ 0   $ 0  
Marketwise, LLC              
Supplemental Disclosures of Cash Flow Information:              
Cash paid for interest     339,000 366,000 $ 1,165,000    
Cash paid for amounts included in the measurement of lease liabilities:              
Operating cash flows from operating leases (875,000) (1,694,000) (2,767,000) (3,106,000) (2,880,000)    
Operating lease right-of-use assets obtained in exchange for lease obligations (398,000) 0 (409,000) (5,051,000) 0    
Supplemental Disclosures of Non-Cash Investing and Financing Activities:              
Property and equipment included in accounts payable     0 1,010,000 0    
Reconciliation of Cash and Cash Equivalents and Restricted Cash:              
Cash and cash equivalents 241,532,000 119,479,000 114,422,000 170,520,000 132,237,000    
Restricted cash 500,000 504,000 505,000 1,564,000 633,000    
Total $ 242,032,000 $ 119,983,000 $ 114,927,000 $ 172,084,000 $ 132,870,000   $ 102,965,000