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Segment (Tables) | 12 Months Ended
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Dec. 31, 2023
Segment Reporting [Abstract] |
Schedule of operating segment results | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | RMB | ​ | RMB | ​ | RMB
LiDAR segment |  |  |  |  |  |
Revenue: |  | ​ |  | ​ |  | ​
Product revenues |  | 686,533 |  | 1,127,900 |  | 1,738,027
Service revenues | ​ | 14,702 | ​ | 50,803 | ​ | 112,099
Cost: | ​ | ​ | ​ | ​ | ​ | ​
Cost of products sold | ​ | 326,160 | ​ | 707,617 | ​ | 1,176,472
Cost of service revenues | ​ | 4,609 | ​ | 12,683 | ​ | 30,329
Segment profit | ​ | 370,466 | ​ | 458,403 | ​ | 643,325
​ |  | ​ |  | ​ |  | ​
Gas detection segment |  |  |  |  |  | ​
Gas detection product revenues |  | 19,533 |  | 23,967 |  | 26,863
Cost of products sold |  | 8,203 |  | 10,383 |  | 8,810
Segment profit |  | 11,330 |  | 13,584 |  | 18,053
​ | ​ | ​ | ​ | ​ | ​ | ​
Total segment profit |  | 381,796 |  | 471,987 |  | 661,378
Schedule of reconciliation of the reportable segments' to consolidated loss before income tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | RMB | ​ | RMB | ​ | RMB
Total profit for reportable segments |  | 381,796 |  | 471,987 |  | 661,378
Unallocated amounts* |  |  |  |  |  | ​
Sales and marketing expenses |  | (69,266) |  | (104,835) |  | (148,798)
General and administrative expenses |  | (236,713) |  | (201,007) |  | (320,144)
Research and development expenses |  | (368,435) |  | (555,179) |  | (790,547)
Other operating income, net |  | 27,333 |  | 10,817 |  | 26,520
Interest income |  | 32,584 |  | 58,734 |  | 99,813
Interest expenses | ​ | — | ​ | — | ​ | (3,069)
Foreign exchange (loss) gains |  | (13,275) |  | 20,858 |  | (452)
Other (loss) income, net |  | 118 |  | (2,161) |  | 34
Loss before income tax |  | (245,858) |  | (300,786) |  | (475,265)
*The Group does not distinguish expenses between segments in its internal reporting, and reports expenses by nature as a whole.
Schedule of long-term assets disaggregated by the different geographic locations | ​
​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ |  | 2022 |  | 2023
​ | ​ | RMB | ​ | RMB
Mainland China | ​ | 665,511 |  | 1,144,643
Thailand | ​ | — | ​ | 39,312
North America | ​ | 14,351 |  | 2,146
Switzerland | ​ | — | ​ | 103
Total long-term assets | ​ | 679,862 |  | 1,186,204
​

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- Definition Tabular disclosure of long-lived assets, excluding financial instruments, long-term customer relationships of a financial institution, mortgage rights, deferred policy acquisition costs, and deferred tax assets, by geographic areas located in the entity's country of domicile and foreign countries in which the entity holds assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph b -SubTopic 10 -Topic 280 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 + Details
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- Definition Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-31 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-25 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 + Details
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