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Revenue Recognition - Capitalized Service Contract Costs (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Capitalized Contract Cost [Roll Forward]
Capitalized costs, beginning balance	$ 107,236
Royalties and sales commissions – additions	55,502
Revenue share and cost per acquisition fees – additions	77,437
Amortization of capitalized costs	(50,889)
Capitalized costs, ending balance	$ 189,286

X

- Definition

Capitalized Contract Cost, Additions, Revenue Share Fees

+ References

No definition available.

+ Details

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X

- Definition

Capitalized Contract Cost, Additions, Royalties And Sales Commissions

+ References

No definition available.

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Namespace Prefix:	mktw_
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X

- Definition

Capitalized Contract Cost

+ References

No definition available.

+ Details

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Namespace Prefix:	mktw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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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

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Namespace Prefix:	us-gaap_
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X

- 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

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