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Leases - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Lessee Lease Description [Line Items] |  |  |  |
Lease expiration date |  | Mar. 31, 2025 |  |
Payments for lease termination fee |  | $ 671,000 |  |
Contribution as credit against lease payments |  | $ 180,000 |  |
Payments towards leasehold improvements |  |  | $ 373,000 |
Letter of credit amount payable | $ 575,000 |  |  |
Reduction in letters of credit | $ 100,000 |  |  |
Mississauga, Canada [Member] |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Lease expiration date |  | Nov. 30, 2021 |  |
Lease commencement period |  | November 2016 |  |
Lease term (in months) |  | 60 months |  |
Wichita, Kansas [Member] |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Lease term (in months) |  | 120 days |  |
Letter of Credit | Certificates of Deposit | Other Assets |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Letters of credit outstanding amount |  | $ 575,000 |  | $ 575,000

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- Definition Contribution as credit against lease payments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Lease commencement period. + References No definition available. + Details
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Namespace Prefix: | mchx_
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- Definition Payments for lease termination fee. + References No definition available. + Details
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Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
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Balance Type: | na
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Balance Type: | na
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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