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Summary of Significant Accounting Policies - Warrants (Details) - shares | Dec. 19, 2023 | Dec. 31, 2023
--- | --- | ---
Class of Warrant or Right [Line Items] |  |
Warrants outstanding |  | 9,131,250
Warrants issued in connection with business combination | 340,250 |
Public Warrants | Initial Public Offering |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding |  | 8,625,000
Private Placement Warrants | Initial Public Offering |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding |  | 506,250

X
- Definition Number of warrants issued in connection with business combination. + References No definition available. + Details
Name: | msai_WarrantsIssuedInConnectionWithBusinessCombination
Namespace Prefix: | msai_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=msai_PublicWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=msai_PrivatePlacementWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |