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v3.25.3

Taxes - Additional Information (Detail) | Sep. 30, 2025 | Dec. 31, 2024
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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