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Reverse Recapitalization - Reconciliation of elements of Merger to cash flows (Details) - Legacy SMAP $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Reverse Recapitalization
Cash (Trust)	$ 17,996
Redemptions	(16,430)
Less: fees to underwriters and advisors	(3,910)
Net cash due to Merger recapitalization	(2,344)
Issuance of Financing notes	4,481
Net cash received from Financing transaction and Merger recapitalization	$ 2,137

X

- Definition

The amount of cash inflow through reverse recapitalization.

+ References

No definition available.

+ Details

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Namespace Prefix:	msai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of recapitalization costs for professional fees associated with restructuring debt and equity mixture that do not qualify for capitalization.

+ References

No definition available.

+ Details

Name:	msai_DecreaseInRecapitalizationCosts
Namespace Prefix:	msai_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of net cash received due to Merger recapitalization.

+ References

No definition available.

+ Details

Name:	msai_NetCashDueToMergerRecapitalization
Namespace Prefix:	msai_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of cash paid during the reporting period for redemption of shares.

+ References

No definition available.

+ Details

Name:	msai_PaymentsForRedemptionOfSharesInReverseRecapitalization
Namespace Prefix:	msai_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash outflow for issuance of financing notes in reverse recapitalization.

+ References

No definition available.

+ Details

Name:	msai_PaymentsToAcquireFinancingNotesInReverseRecapitalization
Namespace Prefix:	msai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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:	msai_RecapitalizationsAndRelatedCostsLineItems
Namespace Prefix:	msai_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Net contributions from Business Combination and PIPE Financing

+ References

No definition available.

+ Details

Name:	msai_ReverseRecapitalizationNet
Namespace Prefix:	msai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=msai_SportsMapTechAcquisitionCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: