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Prepayments and other current assets - Additional Information (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Provision for prepayments and other current assets | ¥ 0 | ¥ 1,310

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