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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, 2024 USD ($)
Performance obligations:
Research and development	$ 42,339
Option rights	41,250
Total performance obligations	$ 83,589

X

- 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_
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Balance Type:	credit
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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

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

X

- References

No definition available.

+ Details

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

X

- 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

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