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Income taxes - Movement of the valuation allowance for the deferred tax assets (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Tax Assets [Roll Forward] |  |  |
Beginning balance | ¥ 537,172 | ¥ 550,520 | ¥ 362,371
Increase during the year | 45,472 | 121,245 | 188,149
Reversal of net operating loss carryforwards due to the Restructuring | 0 | (134,593) | 0
Ending balance | ¥ 582,644 | ¥ 537,172 | ¥ 550,520

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- Definition Deferred Tax Assets + References No definition available. + Details
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Namespace Prefix: | exc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- 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_
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