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Parent only financial information - Condensed statements of comprehensive loss (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Condensed statements of comprehensive loss |  |  |  |
Research and development expenses | ¥ 1,210,871 | $ 175,560 | ¥ 1,209,385 | ¥ 706,018
General and administrative expenses | 1,180,218 | 171,116 | 506,873 | 215,008
Interest income (including related parties: nil, RMB717 and RMB9,069 for the years ended December 31, 2020, 2021 and 2022, respectively) | 12,444 | 1,804 | 11,783 | 28,480
Interest expenses (including related parties: RMB872, RMB212 and RMB18,808 for the years ended December 31, 2020, 2021 and 2022, respectively) | 51,136 | 7,414 | 131,666 | 59,128
Foreign currency exchange gains (losses), net | (18,216) | (2,641) | 18,315 | 54,842
Change in fair value of an equity security | (16,843) | (2,442) |  |
Income (loss) from equity method investments | (137,391) | (19,920) | (2,519) | 148
Loss before income taxes | (1,519,638) | (220,327) | (1,181,985) | (439,776)
Income tax expenses | 21,571 | 3,128 | 3,447 | 228
Net loss attributable to ECARX Holdings Inc. | (1,539,301) | $ (223,179) | (1,179,615) | (439,659)
Parent Company [Member] |  |  |  |
Condensed statements of comprehensive loss |  |  |  |
General and administrative expenses | (26,005) |  | (17,660) |
Interest income (including related parties: nil, RMB717 and RMB9,069 for the years ended December 31, 2020, 2021 and 2022, respectively) | 6,565 |  | 885 | 431
Interest expenses (including related parties: RMB872, RMB212 and RMB18,808 for the years ended December 31, 2020, 2021 and 2022, respectively) | (3,132) |  | (514) |
Foreign currency exchange gains (losses), net | (14,459) |  | 12,478 | 55,213
Change in fair value of an equity security | (16,843) |  |  |
Income (loss) from equity method investments | (1,486,141) |  | (1,176,110) | (495,303)
Loss before income taxes | (1,540,015) |  | (1,180,921) | (439,659)
Net loss attributable to ECARX Holdings Inc. | ¥ (1,540,015) |  | ¥ (1,180,921) | ¥ (439,659)

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 730 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6472174&loc=d3e58812-109433 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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