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Mezzanine equity - Rights, preferences and privileges of preferred shares (Details)	12 Months Ended
	Dec. 31, 2022 D
Mezzanine equity
Number of days within which a material breach is to be cured	30
Number of days within which a material illegal act is to be cured	30
Percentage of investor directors to nominate and appoint a successor of Mr. Ziyu Shen	0.67%
Number of days after the resignation of Mr. Ziyu Shen, to appoint a successor	30
Redemption price percentage	100.00%
Interest rate percentage	8.00%
Conversion ratio	1
Preferred Preference Amount, percentage	100
Ordinary Preference Amount, percentage	100

X

- Definition

The percentage of liquidation preference (or restrictions) of common stock in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

+ References

No definition available.

+ Details

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Namespace Prefix:	exc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of days after the resignation of Mr. Ziyu Shen, a successor is to be nominated and appointed, considered for redemption of temporary equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	exc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of days within which a material breach is to be cured by the company, considered for redemption of temporary equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	exc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of days within which a material illegal act is to be cured, considered for redemption of temporary equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	exc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of investor directors to nominate and appoint a successor of Mr. Ziyu Shen, considered for redemption of temporary equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	exc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage rate used to calculate interest payments on temporary equity.

+ References

No definition available.

+ Details

Name:	exc_TemporaryEquityInterestRatePercentage
Namespace Prefix:	exc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

+ References

No definition available.

+ Details

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Namespace Prefix:	exc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage of redemption price of Preferred share on issuance price.

+ References

No definition available.

+ Details

Name:	exc_TemporaryEquityRedemptionPricePercentage
Namespace Prefix:	exc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of common shares issuable upon conversion for each share of preferred stock to be converted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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