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Allowance for Advertiser Credits Activity (Detail) - Allowances for Advertiser Credits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Allowance For Advertiser Credits [Abstract]
Balance at beginning of period	$ 662	$ 153
Additions charged against revenue	248	1,029
Credits processed and other	753	520
Balance at end of period	$ 157	$ 662

X

- Definition

Allowance for advertiser credits.

+ References

No definition available.

+ Details

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Namespace Prefix:	mchx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- 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=123577603&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=124255206&loc=SL82895884-210446

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: