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Warrant liabilities - ECARX Warrants in connection with the Merger - Movements (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2022 CNY (¥)
ECARX Warrants
Warrant liabilities
Addition	¥ 13,172
Change in fair value included in losses	3,245
Foreign exchange translation	127
Liability at the end	16,544
ECARX Public Warrants
Warrant liabilities
Addition	8,277
Change in fair value included in losses	1,991
Foreign exchange translation	78
Liability at the end	10,346
ECARX Private Warrants
Warrant liabilities
Addition	4,895
Change in fair value included in losses	1,254
Foreign exchange translation	49
Liability at the end	¥ 6,198

X

- Definition

The amount of increase in warrants or rights outstanding, through additions.

+ References

No definition available.

+ Details

Name:	exc_WarrantsAndRightsOutstandingAdditions
Namespace Prefix:	exc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of increase (decrease) in warrants or rights outstanding, through changes in fair value included in losses.

+ References

No definition available.

+ Details

Name:	exc_WarrantsAndRightsOutstandingChangeInFairValueIncludedInLosses
Namespace Prefix:	exc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of increase (decrease) in warrants or rights outstanding, through differences from foreign exchange translation.

+ References

No definition available.

+ Details

Name:	exc_WarrantsAndRightsOutstandingForeignExchangeTranslations
Namespace Prefix:	exc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=exc_EcarxWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=exc_EcarxPublicWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=exc_EcarxPrivateWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: