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Allowance for Advertiser Credits Activity (Detail) - Allowances for Advertiser Credits [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Allowance for Advertiser Credits [Abstract] |  |
Balance at beginning of period | $ 153 | $ 543
Additions charged against revenue | 1,029 | 242
Credits processed and other | 520 | 632
Balance at end of period | $ 662 | $ 153

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- Definition Allowance for advertiser credits. + References No definition available. + Details
Name: | mchx_AllowanceForAdvertiserCreditsAbstract
Namespace Prefix: | mchx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The sum of the periodic provision charged against revenue based on an estimate of future reductions in advertiser's payment obligations related to delivered services. + References No definition available. + Details
Name: | mchx_AllowanceForAdvertiserCreditsAdditions
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Allowance for doubtful accounts receivable write-offs and other. + References No definition available. + Details
Name: | mchx_AllowanceForDoubtfulAccountsReceivableWriteOffsAndOther
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=mchx_AllowancesForAdvertiserCreditsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |