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Debt - Schedule of Long-term Debt Instruments (Details) - Revolving Credit Facility - Line of Credit - Marketwise, LLC - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Total principal $ 0 $ 5,390
Less: current portion 0 (4,256)
Total long-term portion of loan payable 0 1,134
Advance due May 6, 2020    
Line of Credit Facility [Line Items]    
Total principal 0 1,988
Advance due December 22, 2021    
Line of Credit Facility [Line Items]    
Total principal $ 0 $ 3,402