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Supplemental Financial Statement Information - Summary of Interest income and other (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Interest And Other Income [Abstract] |  |  |  |
Interest Income |  | $ 5 | $ 2 | $ 102
Interest Expense & Foreign Currency | $ (19) | 23 | (32) | 33
Other | 2,505 | 4 | 2,504 | 7
Interest income and other, net | $ 2,486 | $ 32 | $ 2,474 | $ 142

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- Definition Interest expense and foreign currency. + References No definition available. + Details
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Balance Type: | debit
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- Definition Interest income and other, net. + References No definition available. + Details
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Namespace Prefix: | mchx_
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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
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of interest income earned from interest bearing assets classified as other. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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