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Income taxes - Withholding tax on undistributed dividends (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Withholding tax rate (in percent)	10.00%
Deferred tax liability accrued for dividend withholding taxes	¥ 0	¥ 0	¥ 0

X

- Definition

Represents the deferred tax liability accrued for dividend withholding taxes.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the withholding tax rate.

+ References

No definition available.

+ Details

Name:	exc_WithholdingTaxRate
Namespace Prefix:	exc_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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