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Balance Sheet Components - Schedule of Accrued Expenses (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Accrued expenses | $ 2,777,394 | $ 111,146 |
Marketwise, LLC |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Commission and bonus | 45,456,000 | 17,271,000 | $ 24,570,000
Payroll and benefits | 3,437,000 | 3,645,000 | 2,520,000
Accrued interest |  | 0 | 325,000
Other accrued expenses | 16,365,000 | 11,218,000 | 6,111,000
Accrued expenses | $ 65,258,000 | $ 32,134,000 | $ 33,526,000

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