XML 54 R47.htm IDEA: XBRL DOCUMENT
v3.25.1

Asset Impairment - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Impairment loss | $ 2,047 | [1] | $ 528 | [2]
Obsolete Assets [Member] |  |  |  |
Impairment loss | 64 |  |  |
Renewable Electricity Generation Site [Member] |  |  |  |
Impairment loss |  |  | 312 |
Proceeds received |  |  | 1,000 |
Renewable Electricity Generation Site [Member] | Obsolete Assets [Member] |  |  |  |
Impairment loss | 10 |  |  |
Renewable Natural Gas [Member] |  |  |  |
Impairment loss | 1,993 | [1] | 216 | [2]
Renewable Natural Gas [Member] | Customer Contracts [Member] |  |  |  |
Impairment loss | 54 |  |  |
Renewable Natural Gas [Member] | Obsolete Assets [Member] |  |  |  |
Impairment loss | $ 1,983 |  | $ 216 |
[1] | Significant expenses regularly provided to the CODM.
[2] | Significant expenses regularly provided to the CODM.

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-4 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow from operating activities classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-25 + Details
Name: | us-gaap_ProceedsFromOtherOperatingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=mntk_AssetsDeemedObsoleteOrNon-OperableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mntk_RenewableElectricityGenerationSiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mntk_RenewableNaturalGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |