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v3.25.1

Defined Contribution Plan - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution plan, employer matching contribution, percent of match | 50.00% |
Defined contribution plan, employer matching contribution, percent of employees' gross pay | 4.00% |
Defined contribution plan, cost | $ 244 | $ 221
Safe Harbor Contribution [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution plan, maximum annual contributions per employee, percent | 3.00% |
Defined contribution plan, employer matching contribution, vesting period | 4 years |

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- Definition Defined contribution plan, employer matching contribution, vesting period. + References No definition available. + Details
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Namespace Prefix: | mntk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanNameAxis=mntk_SafeHarborContributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |