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Acquisitions - Summary of Unaudited Proforma Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Business Acquisition Pro Forma Information [Abstract]
Revenue	$ 25,394	$ 79,264
Net loss applicable to common stockholders	$ (1,500)	$ (4,454)

X

- Definition

Business acquisitions pro forma net income loss available to common stockholders basic.

+ References

No definition available.

+ Details

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Namespace Prefix:	mchx_
Data Type:	xbrli:monetaryItemType
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X

- References

No definition available.

+ Details

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X

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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