XML 64 R54.htm IDEA: XBRL DOCUMENT
v3.21.2

Commitments, Contingencies, and Taxes - Additional Information (Detail) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Commitments Contingencies Taxes And Other [Abstract] |  |
Percentage of valuation allowance | 100.00% | 100.00%

X
- 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

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