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Stockholders' Equity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	May 12, 2023	Apr. 17, 2023
Subsidiary or Equity Method Investee [Line Items]
Stock offering, amount				$ 300,000,000
At-the-Market
Subsidiary or Equity Method Investee [Line Items]
Sale of stock, maximum aggregate offering price			$ 100,000,000
Sales of stock (in shares)	0	931,250
Gross proceeds		$ 2,300,000

X

- Definition

Sale of Stock, Maximum Offering Amount

+ References

No definition available.

+ Details

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

X

- Definition

Sale of Stock, Stock Offering, Amount

+ References

No definition available.

+ Details

Name:	carm_SaleOfStockStockOfferingAmount
Namespace Prefix:	carm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.

+ 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_
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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: