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Summary of Significant Accounting Policies - Offering Costs (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 21, 2021	Dec. 31, 2023
Subsidiary, Sale of Stock [Line Items]
Transaction costs		$ 3,910
Transaction costs related to business combination reduced from APIC		$ 7,595
Initial Public Offering
Subsidiary, Sale of Stock [Line Items]
Transaction costs	$ 2,823
Underwriting commissions	2,300
Other offering costs	523
Allocated to temporary equity	2,686
Allocated to additional paid-in capital	$ 137

X

- Definition

The amount of other offering costs incurred.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of offering discounts and commissions incurred for underwriters.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of transaction costs incurred related to shares during the period.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of transaction costs allocate to additional paid in capital.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of transaction costs allocate to temporary equity.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

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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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