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Stock-Based Compensation - Stock-based Compensation Expense (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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total stock-based compensation expense | $ 47,445 | $ 78,627 | $ 648,520 | $ 99,124 | $ 553,600 | $ 20,439 | $ 28,212
Cost of revenue |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total stock-based compensation expense | 10,568 | 15,058 | 124,916 | 18,226 | 102,736 | 5,025 | 21,889
Sales and marketing |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total stock-based compensation expense | 840 | 1,022 | 14,910 | 2,225 | 10,567 | 0 | 6,323
General and administrative |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total stock-based compensation expense | $ 36,037 | $ 62,547 | $ 508,694 | $ 78,673 | $ 440,297 | $ 15,414 | $ 0

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