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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedule of estimated useful life of property and equipment | Depreciation on property and equipment is calculated on the straight-line method over the estimated useful lives of the assets as below:
Category |  | Estimated useful life
Machinery and electronic equipment |  | 3 – 10 years
Transportation vehicles |  | 4 years
Office and other equipment |  | 5 years
Leasehold improvements |  | Shorter of the lease term and the estimated useful lives of the assets
Schedule of intangible assets, net | In determining the useful life of an intangible asset, the Group considers the factors such as the expected use of the asset by the Group, and any legal, regulatory, or contractual provisions that may limit the useful life:
Category |  | Estimated useful life
Software |  | 3 years
Software license rights |  | 3 years
Patent |  | 3 years
Trademarks |  | 10 years
Intangible assets, net consisted of the following:
| As of December 31,
| 2022 |  | 2023
| RMB |  | RMB
Software | 103,509 |  |  | 121,950 |
Software license rights | — |  |  | 143,725 |
Others | — |  |  | 2,794 |
Intangible assets | 103,509 |  |  | 268,469 |
Less: accumulated amortization | (58,648) |  |  | (86,183) |
Less: impairment provision | — |  |  | (2,945) |
Intangible assets, net | 44,861 |  |  | 179,341 |
Schedule of prior period reclassifications |
| As of December 31, 2022
| Before reclassification |  | After reclassification
| RMB |  | RMB
Provisions | — |  |  | 30,716 |
Other non-current liabilities | 30,716 |  |  | — |
| Year ended December 31, 2021 |  | Year ended December 31, 2022
| Before reclassification |  | After reclassification |  | Before reclassification |  | After reclassification
| RMB |  | RMB |  | RMB |  | RMB
Selling and marketing expenses | (82,827) |  |  | — |  |  | (86,597) |  |  | — |
General and administrative expenses | (525,041) |  |  | — |  |  | (1,223,610) |  |  | — |
Selling, general and administrative expenses | — |  |  | (607,868) |  |  | — |  |  | (1,310,207) |
Change in fair value of an equity security | — |  |  | — |  |  | (16,843) |  |  | — |
Gains on sale of an equity security | — |  |  | — |  |  | 59,728 |  |  | — |
Gains on deconsolidation of a subsidiary | 10,579 |  |  | — |  |  | 71,974 |  |  | — |
Change in fair value of warrant liabilities | (111,299) |  |  | — |  |  | (3,245) |  |  | — |
Government grants | 34,507 |  |  | — |  |  | 59,393 |  |  | — |
Foreign currency exchange gains (losses), net | 18,315 |  |  | — |  |  | (18,216) |  |  | — |
Other non-operating (expenses) income | — |  |  | (47,898) |  |  | — |  |  | 152,791 |

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- Definition Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483443/250-10-50-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483443/250-10-50-7 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483443/250-10-50-9 + Details
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