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Moderna Collaboration and License Agreement - Schedule of Estimated Revenue Expected to be Recognized in The Future Related to Performance Obligations (Details) $ in Thousands | Dec. 31, 2024 USD ($)
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Performance obligations: |
Research and development | $ 35,301
Option rights | 41,250
Total performance obligations | $ 76,551

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- Definition Amount of transaction price allocated to option rights performance obligation that has not been recognized as revenue. + References No definition available. + Details
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Namespace Prefix: | carm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of transaction price allocated to research and development performance obligation that has not been recognized as revenue. + References No definition available. + Details
Name: | carm_RevenueRemainingPerformanceObligationResearchAndDevelopmentAmount
Namespace Prefix: | carm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RevenuePerformanceObligationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
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Namespace Prefix: | us-gaap_
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