XML 111 R93.htm IDEA: XBRL DOCUMENT
v3.25.1

Long-term investments - Equity securities (Details) $ / shares in Units, ¥ in Thousands, kr in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2021 CNY (¥) shares | Jul. 01, 2021 USD ($) shares | Jan. 31, 2023 USD ($) | May 31, 2022 USD ($) day $ / shares shares | Apr. 30, 2022 CNY (¥) shares | Apr. 30, 2022 USD ($) shares | Apr. 30, 2022 SEK (kr) shares | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 20, 2022 $ / shares
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets to be disposed | ¥ |  |  |  |  |  |  |  | ¥ 1,039 |  | ¥ 7,292 |  | ¥ 0 |  |  |
Ordinary shares, par value per share (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.000005
Equity securities | ¥ |  |  |  |  |  |  |  | 5,316 |  | 48,580 |  |  |  |  |
Luminar Technologies, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities (in shares) | shares |  |  |  | 2,030,374 |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  |  | $ 12,588 |  |  |  | 48,580 |  | 5,316 |  |  | $ 6,842 | $ 728 |
Equity securities, annual amount |  |  |  |  |  |  |  | ¥ 44,019 | $ 6,114 | ¥ 22,451 | $ 3,208 |  |  |  |
Luminar Technologies, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitment | $ |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |
Trading days | day |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value per share (in USD per share) | $ / shares |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |
Common shares in Zenseact AB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newly issued common shares subscribed | shares | 8,834 | 8,834 |  |  | 6,447 | 6,447 | 6,447 |  |  |  |  |  |  |  |
Equity interest acquired | 15.00% | 15.00% |  |  | 13.50% | 13.50% | 13.50% |  |  |  |  |  |  |  |
Cash consideration to acquire equity securities | ¥ 675,824 | $ 106,000 |  |  |  |  | kr 800,000 |  |  |  |  |  |  |  |
Investment's carrying amount gain |  |  |  |  | ¥ 35,153 | $ 5,297 |  |  |  |  |  |  |  |  |
Impairment of assets to be disposed |  |  | $ 115,000 |  | 763,192 | 115,000 |  |  |  |  |  |  |  |  |
Gain of disposed investment consideration |  |  |  |  | ¥ 24,575 | $ 3,703 |  |  |  |  |  |  |  |  |

X
- Definition Equity Securities, Shares + References No definition available. + Details
Name: | exc_EquitySecuritiesShares
Namespace Prefix: | exc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of equity interest acquired in equity security without a readily determinable fair value. + References No definition available. + Details
Name: | exc_EquitySecuritiesWithoutReadilyDeterminableFairValueEquityInterests
Namespace Prefix: | exc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the newly issued common shares subscribed in equity security without a readily determinable fair value. + References No definition available. + Details
Name: | exc_EquitySecuritiesWithoutReadilyDeterminableFairValueNumberOfSharesAcquired
Namespace Prefix: | exc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other Commitment, Threshold Consecutive Trading Days + References No definition available. + Details
Name: | exc_OtherCommitmentThresholdConsecutiveTradingDays
Namespace Prefix: | exc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cash outflow to acquire investment in equity security without a readily determinable fair value. + References No definition available. + Details
Name: | exc_PaymentsToAcquireEquitySecuritiesWithoutReadilyDeterminableFairValue
Namespace Prefix: | exc_
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 of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
Name: | us-gaap_GainOnSaleOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-15 + Details
Name: | us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
Name: | us-gaap_RealizedInvestmentGainsLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=exc_CommonSharesInZenseactAbMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |