XML 180 R30.htm IDEA: XBRL DOCUMENT
v3.25.2

Moderna Collaboration and License Agreement (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Revenue from Contract with Customer [Abstract] |  |
Schedule of Estimated Revenue Expected to be Recognized in The Future Related to Performance Obligations | ​
​ | ​ | ​ | ​
​ |  | Transaction
​ | ​ | price unsatisfied
Performance obligations: |  | ​ |
Option rights | ​ | $ | 41,250
| The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of December 31, 2024 (in thousands): ​
​ | ​ | ​ | ​
​ |  | Transaction
​ | ​ | price unsatisfied
Performance obligations: |  | ​ |
Research and development | ​ | $ | 35,301
Option rights | ​ |  | 41,250
Total performance obligations | ​ | $ | 76,551
Schedule of Changes in Deferred Revenue | The following table summarizes the changes in deferred revenue (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Six Months Ended June 30,
​ |  | 2025 |  | 2024
Balance at the beginning of the period | ​ | $ | 44,979 | ​ | $ | 46,413
Deferral of revenue | ​ |  | — | ​ |  | 6,090
Recognition of deferred revenue | ​ |  | (3,729) | ​ |  | (10,594)
Balance at the end of the period | ​ | $ | 41,250 | ​ | $ | 41,909
| The following table summarizes the changes in deferred revenue (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2024 |  | 2023
Balance at the beginning of the period | ​ | $ | 46,413 | ​ | $ | 47,459
Deferral of revenue | ​ |  | 16,198 | ​ |  | 13,873
Recognition of unearned revenue | ​ |  | (17,632) | ​ |  | (14,919)
Balance at the end of the period | ​ | $ | 44,979 | ​ | $ | 46,413

X
- Definition Tabular disclosure of changes in deferred revenue. + References No definition available. + Details
Name: | carm_ScheduleOfChangesInDeferredRevenueTableTextBlock
Namespace Prefix: | carm_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration