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Supplemental Financial Statement Information - Summary of Interest Income and Other (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Interest And Other Income [Abstract] |  |  |  |
Interest Income | $ 7 | $ 1 | $ 8 | $ 103
Interest Expense & Foreign Currency | (14) | (11) | (45) | (19)
Other | (14) | 7 | 2,490 | 55
Total | $ (21) | $ (3) | $ 2,453 | $ 139

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- Definition Interest expense and foreign currency. + References No definition available. + Details
Name: | mchx_InterestExpenseAndForeignCurrency
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Interest income and other, net. + References No definition available. + Details
Name: | mchx_InterestIncomeAndOtherNet
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Interest income (expense) other. + References No definition available. + Details
Name: | mchx_InterestIncomeExpenseOther
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). + References No definition available. + Details
Name: | us-gaap_InterestAndOtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InterestAndOtherIncomeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration