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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 | Jun. 30, 2025 USD ($)
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Performance obligations: |
Option rights | $ 41,250

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

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