SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Collaboration Arrangements (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Amount of reimbursement received from third parties under JDA	$ 1,295	$ 3,389
Payment for demo car services	$ 2,000

Amount paid under a collaborative arrangement for the development of demo car services and related activities during the reporting period.

No definition available.

Name:	cgct_CollaborativeArrangementDemoCarDevelopmentServicesPayment
Namespace Prefix:	cgct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration