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Long-term investments - Equity securities (Details) $ / shares in Units, kr in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2021 USD ($) shares | Jul. 01, 2021 CNY (¥) shares | Jan. 31, 2023 USD ($) | May 31, 2022 USD ($) day $ / shares shares | Apr. 30, 2022 USD ($) shares | Apr. 30, 2022 CNY (¥) shares | Apr. 30, 2022 SEK (kr) shares | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 20, 2022 $ / shares
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss recognized |  |  |  |  |  |  |  |  |  |  | ¥ 0 | ¥ 0 |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  |  |  |  | ¥ 7,292,000 |  | 0 | ¥ 0 |  |  |
Ordinary shares, par value per share (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.000005
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 48,580,000 | ¥ 69,319,000 |
Luminar Technologies, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities (in shares) | shares |  |  |  | 2,030,374 |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  |  | $ 12,588 |  |  |  | $ 6,842 |  | $ 10,050 |  |  | ¥ 48,580,000 | ¥ 69,319,000 |
Equity securities, annual amount |  |  |  |  |  |  |  | $ 3,208 | ¥ 22,451,000 | $ 2,538 | ¥ 16,843,000 |  |  |  |
Luminar Technologies, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading days | day |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value per share (in USD per share) | $ / shares |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |
Other commitment | $ |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |
Common shares in Zenseact AB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newly issued common shares subscribed | shares | 8,834 | 8,834 |  |  | 6,447 | 6,447 | 6,447 |  |  |  |  | 8,834 |  |  |
Equity interest acquired | 15.00% | 15.00% |  |  | 13.50% | 13.50% | 13.50% |  |  |  |  | 15.00% |  |  |
Cash consideration to acquire equity securities | $ 106,000 | ¥ 675,824,000 |  |  |  |  | kr 800,000 |  |  |  |  |  |  |  |
Investment's carrying amount gain |  |  |  |  | $ 5,297 | ¥ 35,153,000 |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  | $ 115,000 |  | 115,000 | 763,192,000 |  |  |  |  |  |  |  |  |
Gain of disposed investment consideration |  |  |  |  | $ 3,703 | ¥ 24,575,000 |  |  |  |  |  |  |  |  |

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- 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
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- Definition Amount of impairment loss 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
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- 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
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- 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 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 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(b)(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 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(9)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 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//1943274/2147483589/942-220-S99-1 + Details
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- 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
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