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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 |  |  |  |  |  |  |

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