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Taxes - Additional Information (Detail)	Sep. 30, 2025	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Percentage of valuation allowance	100.00%	100.00%

X

- Definition

Deferred tax assets, valuation allowance, percentage.

+ References

No definition available.

+ Details

Name:	mchx_DeferredTaxAssetsValuationAllowancePercentage
Namespace Prefix:	mchx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration