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Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - Marketwise, LLC - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]              
Property and equipment, gross $ 3,565   $ 3,565   $ 3,458 $ 3,168  
Less: Accumulated depreciation and amortization (2,265)   (2,265)   (2,041) (1,590)  
Property and equipment, net 1,300   1,300   1,417 1,578  
Depreciation expense 114 $ 138 224 $ 226 451 624 $ 813
Furniture and fixtures              
Property, Plant and Equipment [Line Items]              
Property and equipment, gross 960   $ 960   $ 960 960  
Estimated Useful Lives     5 years   5 years    
Computers, software and equipment              
Property, Plant and Equipment [Line Items]              
Property and equipment, gross 1,327   $ 1,327   $ 1,220 1,183  
Estimated Useful Lives     3 years   3 years    
Leasehold improvements              
Property, Plant and Equipment [Line Items]              
Property and equipment, gross $ 1,278   $ 1,278   $ 1,278 $ 1,025