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Goodwill and Intangible Assets, Net - Schedule of Intangible Assets, Net (Details) - Marketwise, LLC - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | $ 18,709 | $ 14,121 | $ 14,121 |  |
Accumulated Amortization | (10,265) | (9,042) | (6,940) |  |
Net Book Value | 8,444 | 5,079 | 7,181 |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |  |
Indefinite-lived intangible assets | 1,052 | 199 | 34 |  |
Cost | 19,761 | 14,320 | 14,155 |  |
Intangible assets, net | 9,496 | 5,278 | 7,215 |  |
Cryptocurrencies |  |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |  |
Indefinite-lived intangible assets | 0 | 4 | 34 | $ 347 | $ 857
Internet domain names |  |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |  |
Indefinite-lived intangible assets | 1,052 | 195 |  |  |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | 12,369 | 8,705 | 8,705 |  |
Accumulated Amortization | (7,491) | (6,675) | (5,332) |  |
Net Book Value | $ 4,878 | $ 2,030 | $ 3,373 |  |
Weighted-Average Remaining Useful Life (in years) | 4 years 9 months 18 days | 2 years 8 months 12 days | 3 years 2 months 12 days |  |
Tradenames |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | $ 3,578 | $ 2,921 | $ 2,921 |  |
Accumulated Amortization | (1,637) | (1,433) | (1,089) |  |
Net Book Value | $ 1,941 | $ 1,488 | $ 1,832 |  |
Weighted-Average Remaining Useful Life (in years) | 5 years 9 months 18 days | 4 years 10 months 24 days | 5 years 9 months 18 days |  |
Capitalized software development costs |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | $ 2,762 | $ 2,495 | $ 2,495 |  |
Accumulated Amortization | (1,137) | (934) | (519) |  |
Net Book Value | $ 1,625 | $ 1,561 | $ 1,976 |  |
Weighted-Average Remaining Useful Life (in years) | 3 years 4 months 24 days | 3 years 9 months 18 days | 4 years 9 months 18 days |  |

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