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Divestiture Support Services Fee - Components of Related Party Support Services Fees (Details) - Related Party [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Support Service Fees [Line Items] |  |
Support services fees | $ 205 | $ 1,524
Service Costs |  |
Support Service Fees [Line Items] |  |
Support services fees | 101 | 1,115
Sales and Marketing |  |
Support Service Fees [Line Items] |  |
Support services fees |  | 90
Product Development |  |
Support Service Fees [Line Items] |  |
Support services fees |  | 172
General and Administrative |  |
Support Service Fees [Line Items] |  |
Support services fees | $ 104 | $ 147

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- Definition Support service fees. + References No definition available. + Details
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Namespace Prefix: | mchx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Support services fees. + References No definition available. + Details
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Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_ServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingAndMarketingExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=mchx_ProductDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |