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Revenue Recognition - Capitalized Service Contract Costs (Details) - Marketwise, LLC - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Capitalized Contract Cost [Roll Forward] |  |  |  |
Capitalized costs, beginning balance | $ 107,236 | $ 42,314 | $ 35,565 | $ 23,259
Sales commissions - additions | 43,770 | 43,273 | 18,984 | 15,940
Revenue share fees – additions | 62,491 | 52,193 | 6,284 | 8,468
Amortization of capitalized costs | (31,920) | (30,544) | (18,519) | (12,102)
Capitalized costs, ending balance | $ 181,577 | $ 107,236 | $ 42,314 | $ 35,565

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- Definition Capitalized Contract Cost, Additions, Revenue Share Fees + References No definition available. + Details
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- Definition Capitalized Contract Cost, Additions, Sales Commissions + References No definition available. + Details
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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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