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Prepayments and other current assets - Additional information (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract]
Provision for prepayments and other current assets	¥ 0	¥ 0

X

- Definition

Amount of provision for prepaid expense and other current assets.

+ References

No definition available.

+ Details

Name:	exc_PrepaidExpenseAndOtherAssetsCurrentProvision
Namespace Prefix:	exc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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