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Leases - Supplemental Cash Flow Information Relating to Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Leases [Abstract]
Operating cash flows from operating leases	$ 747	$ 729

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- Definition

Operating Lease Payments Proceeds

+ References

No definition available.

+ Details

Name:	cgem_OperatingLeasePaymentsProceeds
Namespace Prefix:	cgem_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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