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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
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
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
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
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
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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