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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