XML 88 R70.htm IDEA: XBRL DOCUMENT
v3.25.1

Description of business and organization - Merger and recapitalization (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 20, 2022 CNY (¥) seat shares | Dec. 20, 2022 USD ($) seat shares | Mar. 05, 2020 CNY (¥) investment | Nov. 30, 2023 CNY (¥) | Apr. 30, 2022 company investment | Dec. 31, 2024 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 $ / shares | Dec. 20, 2022 USD ($) $ / shares shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred shares issued (in shares) | 90,724,289 |  |  |  |  |  |  |  |  |  | 90,724,289
Preferred shares outstanding (in shares) | 90,724,289 |  |  |  |  |  |  |  |  |  | 90,724,289
Number of ordinary shares for each preferred share | 1 | 1 |  |  |  |  |  |  |  |  |
Ordinary shares, par value per share (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.000005
Recapitalization factor per share | $ / shares |  |  |  |  |  |  |  |  |  |  | 1.19295710
Recapitalization factor, pre-money equity value | $ |  | $ 3,400,000 |  |  |  |  |  |  |  |  |
Recapitalization factor, per share multiplier | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 10.00
Number of board members to elect | seat | 2 | 2 |  |  |  |  |  |  |  |  |
Number of equity method investments transferred | investment |  |  |  |  | 3 |  |  |  |  |  |
Number of investment and consulting companies | company |  |  |  |  | 2 |  |  |  |  |  |
Amounts due from related parties |  |  |  |  |  | ¥ 35,367 |  | $ 4,845 | ¥ 74,122 |  |
Amount of loan provided | ¥ |  |  |  | ¥ 50,000 |  |  |  |  |  |  |
Excess of the assets derecognized over the amounts due from the VIE | ¥ |  |  |  |  |  |  | ¥ 61,921 |  |  |  |
VIE's |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Working Capital | ¥ |  |  | ¥ 20,000 |  |  |  |  |  |  |  |
Number of equity method investments spun off | investment |  |  | 3 |  |  |  |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  |  |  |  |  | 100.00% |  |  |  |  |
Merger |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate proceeds | ¥ 270,539 | $ 38,870 |  |  |  |  |  |  |  |  |
Cash proceeds | 43,724 | 6,282 |  |  |  |  |  |  |  |  |
Transaction costs | 293,168 |  |  |  |  |  |  |  |  |  | $ 42,122
Excess cost over proceeds | 22,629 |  |  |  |  |  |  |  |  |  | 3,252
Geely Investment | Merger |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Value of shares received | 139,200 | $ 20,000 |  |  |  |  |  |  |  |  |
Luminar Technologies, Inc | Merger |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Transaction costs | ¥ 87,615 |  |  |  |  |  |  |  |  |  | $ 12,588
Hubei ECARX |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amounts due from related parties | ¥ |  |  |  |  |  | ¥ 205,954 |  |  |  |  |
Amount of loan provided | ¥ |  |  |  |  |  | ¥ 252,287 |  |  |  |  |
Effective annual interest rate (in percent) |  |  |  |  |  | 5.00% |  |  |  |  |
Excess of the assets derecognized over the amounts due from the VIE | ¥ |  |  |  |  |  | ¥ 61,921 |  |  |  |  |
Class B Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of authorized unissued shares designated into this class | 958,958,360 | 958,958,360 |  |  |  |  |  |  |  |  |
Number of ordinary shares for each ordinary share | 1 | 1 |  |  |  |  |  |  |  |  |
Ordinary shares, par value per share (in USD per share) | $ / shares |  |  |  |  |  |  |  | $ 0.000005 |  | $ 0.000005 |
Class B Ordinary Shares | Existing Shareholders |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 48,960,916 | 48,960,916 |  |  |  |  |  |  |  |  |
Common Shares, Class To Be Determined |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of authorized unissued shares designated into this class | 1,000,000,000 | 1,000,000,000 |  |  |  |  |  |  |  |  |
Class A Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of authorized unissued shares designated into this class | 7,766,956,008 | 7,766,956,008 |  |  |  |  |  |  |  |  |
Number of ordinary shares for each ordinary share | 1 | 1 |  |  |  |  |  |  |  |  |
Ordinary shares, par value per share (in USD per share) | $ / shares |  |  |  |  |  |  |  | $ 0.000005 |  | $ 0.000005 |
Number of shares issued (in shares) | 282,564,117 | 282,564,117 |  |  |  |  |  |  |  |  |
Class A Ordinary Shares | Holders of COVA Shares |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 5,870,357 | 5,870,357 |  |  |  |  |  |  |  |  |
Class A Ordinary Shares | Merger Sponsor |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 5,250,000 | 5,250,000 |  |  |  |  |  |  |  |  |
Class A Ordinary Shares | Geely Investment |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 2,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |
Class A Ordinary Shares | Luminar Technologies, Inc |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 1,500,000 | 1,500,000 |  |  |  |  |  |  |  |  |
Class A Ordinary Shares | Lotus Technology Inc |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 1,052,632 | 1,052,632 |  |  |  |  |  |  |  |  |
Class A Ordinary Shares | Existing Ordinary Shareholders |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 193,216,446 | 193,216,446 |  |  |  |  |  |  |  |  |
Class A Ordinary Shares | Existing Preferred Shareholders |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 84,795,039 | 84,795,039 |  |  |  |  |  |  |  |  |
Class A Ordinary Shares | Mr. Shufu Li |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of authorized unissued shares designated into this class | 20,520,820 | 20,520,820 |  |  |  |  |  |  |  |  |
Warrants | Holders Of COVA Warrants |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 23,871,971 | 23,871,971 |  |  |  |  |  |  |  |  |

X
- Definition Amount of business acquisition excess cost over proceeds. + References No definition available. + Details
Name: | exc_BusinessAcquisitionExcessCostOverProceeds
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of aggregate proceeds raised in the merger. + References No definition available. + Details
Name: | exc_BusinessCombinationAggregatedProceeds
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash proceeds raised in the merger. + References No definition available. + Details
Name: | exc_BusinessCombinationCashProceeds
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of the reduction or elimination in equity during the period resulting from restructuring of variable interest entity. + References No definition available. + Details
Name: | exc_DeemedDistributionFromRestructuringOfVariableInterestEntity
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the effective annual interest rate used for discounted present value of loan. + References No definition available. + Details
Name: | exc_EffectiveAnnualInterestRateUsedForDiscountedPresentValueOfLoan
Namespace Prefix: | exc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition In the redesignation of shares, the number of authorized unissued common shares that were redesignated into the specified class. + References No definition available. + Details
Name: | exc_NumberOfAuthorizedUnissuedSharesDesignatedIntoThisClass
Namespace Prefix: | exc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of board members that the entity may elect. + References No definition available. + Details
Name: | exc_NumberOfBoardMembersToElect
Namespace Prefix: | exc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of equity method investments spun off during the period. + References No definition available. + Details
Name: | exc_NumberOfEquityMethodInvestmentsSpunOff
Namespace Prefix: | exc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of equity method investments transferred during the period. + References No definition available. + Details
Name: | exc_NumberOfEquityMethodInvestmentsTransferred
Namespace Prefix: | exc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of investment and consulting companies to which equity method investments were transferred during the period. + References No definition available. + Details
Name: | exc_NumberOfInvestmentAndConsultingCompanies
Namespace Prefix: | exc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The per share of recapitalization factor. + References No definition available. + Details
Name: | exc_RecapitalizationFactorPerShare
Namespace Prefix: | exc_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The per share multiplier, as a component in the Recapitalization Factor related to the merger. + References No definition available. + Details
Name: | exc_RecapitalizationFactorPerShareMultiplier
Namespace Prefix: | exc_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The pre-money equity value of the predecessor entity, as agreed between the parties to the merger, as a component of the Recapitalization Factor. + References No definition available. + Details
Name: | exc_RecapitalizationFactorPremoneyEquityValue
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition In the redesignation of shares, the number of common shares taking the place of each former common share. + References No definition available. + Details
Name: | exc_RedesignationOfSharesNumberOfCommonSharesForEachCommonShare
Namespace Prefix: | exc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition In the redesignation of shares, the number of common shares taking the place of each former preferred share. + References No definition available. + Details
Name: | exc_RedesignationOfSharesNumberOfCommonSharesForEachPreferredShare
Namespace Prefix: | exc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of working capital at specified date. + References No definition available. + Details
Name: | exc_WorkingCapital
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-5 + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 8 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 7 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-7 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_OtherReceivablesNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of shares issued for nonredeemable preferred shares and preferred shares redeemable solely at option of issuer. Includes, but is not limited to, preferred shares issued, repurchased, and held as treasury shares. Excludes preferred shares classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 + Details
Name: | us-gaap_PreferredStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3 + Details
Name: | us-gaap_PreferredStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-3 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478448/946-505-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481203/810-10-50-5A + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=exc_MergerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_GeelyInvestmentHoldingLtd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_LuminarTechnologiesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_HubeiEcarxMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_ExistingShareholdersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=exc_CommonSharesClassToBeDeterminedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_HoldersOfCovaSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_MergerSponsorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_LotusTechnologyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_ExistingOrdinaryShareholdersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_ExistingPreferredShareholdersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_Mr.shufuLiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=exc_HoldersOfCovaWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |