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Notes receivable (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Notes receivable |  |
Notes receivable pledged for notes payable | ¥ 25,034 | ¥ 110,550

X
- Definition Amount of notes receivable pledged for notes payable. + References No definition available. + Details
Name: | exc_NotesReceivablePledgedForNotesPayable
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration