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Summary of Significant Accounting Policies (Details) - USD ($)
 2 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 11 Months Ended 12 Months Ended 14 Months Ended
Mar. 31, 2020
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2021
Jul. 28, 2020
Significant Accounting Policies [Line Items]                          
Cash equivalents   $ 0       $ 0   $ 0 $ 0        
Warrants outstanding (in shares)                         30,980,000
Interest earned on investments held in Trust Account   10,329   $ 0 $ 0 58,984 $ 0 209,593       $ 59,000  
Net loss $ 17,374 21,816,965 $ (21,710,100) 28,405 $ 45,779 106,865 45,779 29,629,640          
Unrecognised tax benefits               0 0        
Unrecognised tax benefits interest and penalties accrued               0 0        
Income tax provisions               0          
Marketwise, LLC                          
Significant Accounting Policies [Line Items]                          
Net loss   $ 7,895,000   80,045,000   622,348,000 96,546,000   538,373,000 $ (27,957,000) $ (18,601,000)    
Accounts receivable, allowance for credit loss               0 0 0      
Goodwill, impairment loss                 0 0 0    
Impairment                 0 0 330,000    
Gain on sale of intangible assets           $ 105,000 0   0 605,000 265,000    
Impairment of long-lived assets                 0 0 0    
Capitalized contract cost, amortization period   4 years       4 years              
Advertising expense                 149,191,000 67,640,000 65,846,000    
Amortization of capitalized software development costs   $ 102,000   104,000   $ 203,000 207,000   415,000 130,000 43,000    
Capitalized software development costs | Marketwise, LLC                          
Significant Accounting Policies [Line Items]                          
Finite-lived intangible asset, useful life           3 years              
Capitalized Cloud Computing Implementation Costs | Marketwise, LLC                          
Significant Accounting Policies [Line Items]                          
Capitalized computer software, gross               356,000 356,000 257,000 630,000    
Amortization of capitalized software development costs                 $ 17,000 64,000 22,000    
Minimum | Marketwise, LLC                          
Significant Accounting Policies [Line Items]                          
Refund period           30 days              
Maximum | Marketwise, LLC                          
Significant Accounting Policies [Line Items]                          
Refund period           90 days              
Cryptocurrencies | Marketwise, LLC                          
Significant Accounting Policies [Line Items]                          
Impairment                     330,000    
Ordinary Shares                          
Significant Accounting Policies [Line Items]                          
Net loss               $ 140,000          
IPO                          
Significant Accounting Policies [Line Items]                          
Warrants outstanding (in shares)   20,700,000       20,700,000   20,700,000 20,700,000        
Private Placement                          
Significant Accounting Policies [Line Items]                          
Warrants outstanding (in shares)   10,280,000       10,280,000   10,280,000 10,280,000        
Common Class A                          
Significant Accounting Policies [Line Items]                          
Ordinary shares subject to possible redemption shares (in shares)   34,185,912       34,185,912   39,576,710 39,576,710        
Potentially dilutive common shares excluded from the computation of weighted-average shares outstanding               30,980,000          
Net loss               $ (210,000)          
Common stock, shares subject to possible redemption (in shares)   34,185,912       34,185,912   34,196,599 34,196,599        
Common Class A | Marketwise, LLC                          
Significant Accounting Policies [Line Items]                          
Net loss   $ 7,895,000   80,045,000   $ 622,348,000 96,546,000   $ 538,373,000 (24,819,000) (18,601,000)    
Common Class B                          
Significant Accounting Policies [Line Items]                          
Net loss               $ 350,000          
Common Class B | Marketwise, LLC                          
Significant Accounting Policies [Line Items]                          
Net loss   $ (456,000)   $ (5,757,000)   $ (6,107,000) $ (38,070,000)   $ (78,398,000) $ (17,969,000) $ (17,135,000)    
Vesting period     25 months     25 months              
Common Class B | Maximum | Marketwise, LLC                          
Significant Accounting Policies [Line Items]                          
Vesting period     8 years     8 years