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v3.23.2

Mezzanine equity - Rights, preferences and privileges of preferred shares (Details) | 12 Months Ended
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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
Name: | exc_CommonStockLiquidationPreferencePercentage
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
Name: | exc_NumberOfDaysAfterResignationOfMr.ZiyuShenToAppointSuccessor
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
Name: | exc_NumberOfDaysWithinWhichMaterialBreachIsToBeCured
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
Name: | exc_NumberOfDaysWithinWhichMaterialIllegalActIsToBeCured
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
Name: | exc_PercentageOfInvestorDirectorsToNominateAndAppointSuccessorOfMr.ZiyuShen
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
Name: | exc_TemporaryEquityLiquidationPreferencePercentage
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
Name: | us-gaap_PreferredStockConvertibleConversionRatio
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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