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v3.22.1

Interest and Other - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2021 USD ($)
Other Income And Expenses [Abstract] |
Contractual settlement of upside payment received | $ 2.5

X
- Definition Contractual settlement of an upside payment received. + References No definition available. + Details
Name: | mchx_ContractualSettlementOfUpsidePaymentReceived
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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