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Commitments, Contingencies, and Taxes - Additional Information (Detail) | Mar. 31, 2021 | Dec. 31, 2020
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Commitments Contingencies Taxes And Other [Abstract] |  |
Percentage of valuation allowance | 100.00% | 100.00%

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- Definition Commitments contingencies taxes and other. + References No definition available. + Details
Name: | mchx_CommitmentsContingenciesTaxesAndOtherAbstract
Namespace Prefix: | mchx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Deferred tax assets, valuation allowance, percentage. + References No definition available. + Details
Name: | mchx_DeferredTaxAssetsValuationAllowancePercentage
Namespace Prefix: | mchx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant