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Income taxes - Movement of the valuation allowance for the deferred tax assets (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets [Roll Forward]
Beginning balance	¥ 582,644	¥ 537,172	¥ 550,520
Increase during the year	170,437	45,472	121,245
Reversal of net operating loss carryforwards due to the Restructuring	0	0	(134,593)
Ending balance	¥ 753,081	¥ 582,644	¥ 537,172

X

- Definition

Deferred Tax Assets

+ References

No definition available.

+ Details

Name:	exc_DeferredTaxAssetsRollForward
Namespace Prefix:	exc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of decrease in the valuation allowance for a specified deferred tax asset, resulting from reversal of operating loss carryforwards due to the restructuring.

+ References

No definition available.

+ Details

Name:	exc_ValuationAllowanceDeferredTaxAssetDecreaseForReversalOfNetOperatingLossCarryforwardsDueToRestructuringAmount
Namespace Prefix:	exc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration