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Leases - Supplemental Cash Flow Information Relating to Leases (Details) - USD ($) $ in Thousands | 6 Months Ended
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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