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Stockholders' Equity (Details) - At-the-Market - USD ($)	9 Months Ended
	Sep. 30, 2024	May 12, 2023
Subsidiary or Equity Method Investee [Line Items]
Sale of stock, maximum aggregate offering price		$ 100,000,000
Sales of stock (in shares)	1,136,384
Sale of stock, consideration received on transaction	$ 2,400,000

X

- Definition

Sale of Stock, Maximum Offering Amount

+ References

No definition available.

+ Details

Name:	carm_SaleOfStockMaximumOfferingAmount
Namespace Prefix:	carm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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

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

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=carm_AtTheMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: