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Leases - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2018 | Jun. 30, 2022 | Apr. 30, 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 |
Contribution from lessor as reimbursement towards leasehold improvements |  | $ 180,000 |  |  |
Payments towards leasehold improvements |  |  | $ 373,000 |  |
Letter of credit amount payable |  |  |  |  | $ 575,000
Line of credit facility increase decrease for period net | $ 100,000 |  |  |  |
Lease termination month and year |  |  |  | 2023-03 |
Mississauga, Canada |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Lease expiration date |  |  |  | Nov. 30, 2021 |
Lease commencement period |  |  |  | November 2016 |
Lease term (in months) |  |  |  | 60 months |
Wichita, Kansas |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Lease agreement description |  |  |  | The Company commenced a new lease for an office space in Wichita, Kansas in June 2020 which continues for a period of 66 months, which we have determined as our expected lease term, and an option to extend the term for two additional periods of three years each. |

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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 Contribution from lessor as reimbursement towards leasehold improvements. + References No definition available. + Details
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Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Lease commencement period. + References No definition available. + Details
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Namespace Prefix: | mchx_
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Balance Type: | na
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- Definition Lease Termination month and year. + References No definition available. + Details
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Balance Type: | na
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- Definition Payments for lease termination fee. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Date which lease or group of leases is set to expire, in YYYY-MM-DD format. + References No definition available. + Details
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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 Description of lessee's operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
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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 https://asc.fasb.org/extlink&oid=128292326&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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI https://asc.fasb.org/extlink&oid=120395691&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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Period Type: |