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Derivative Financial Instruments - Schedule of Location and Amounts and Derivative Instruments Gains and Losses (Details) - Marketwise, LLC - Not Designated as Hedging Instrument - 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
Derivative [Line Items]
Total	$ 2,120	$ (1,124)	$ 1,726	$ (997)
Other Income
Derivative [Line Items]
Total					$ (3,069)	$ (478)	$ (217)
Other Income | Phantom Interests in Net Income
Derivative [Line Items]
Total	394	(1,124)	0	(997)
General and administrative | Phantom Interests in Net Income
Derivative [Line Items]
Total	2,388	0	2,388	0
General and administrative | Option
Derivative [Line Items]
Total	$ (662)	$ 0	$ (662)	$ 0

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

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- Definition

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+ References

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