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Segment - Reportable segments (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Segment Reporting Information [Line Items] |  |  |  |
Total profit | ¥ 661,378 | $ 93,153 | ¥ 471,987 | ¥ 381,796
Sales and marketing expenses | (148,798) | (20,958) | (104,835) | (69,266)
General and administrative expenses | (320,144) | (45,091) | (201,007) | (236,713)
Research and development expenses | (790,547) | (111,346) | (555,179) | (368,435)
Other operating income, net | 26,520 | 3,735 | 10,817 | 27,333
Interest income | 99,813 | 14,058 | 58,734 | 32,584
Interest expenses | (3,069) | (432) |  |
Foreign exchange (loss) gain | (452) | (64) | 20,858 | (13,275)
Other (loss) income, net | 34 | 5 | (2,161) | 118
Net loss before income tax and share of loss in equity method investments | (475,265) | $ (66,940) | (300,786) | (245,858)
Reportable segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total profit | 661,378 |  | 471,987 | 381,796
Sales and marketing expenses | (148,798) |  | (104,835) | (69,266)
General and administrative expenses | (320,144) |  | (201,007) | (236,713)
Research and development expenses | (790,547) |  | (555,179) | (368,435)
Other operating income, net | 26,520 |  | 10,817 | 27,333
Interest income | 99,813 |  | 58,734 | 32,584
Interest expenses | (3,069) |  |  |
Foreign exchange (loss) gain | (452) |  | 20,858 | (13,275)
Other (loss) income, net | 34 |  | (2,161) | 118
Net loss before income tax and share of loss in equity method investments | ¥ (475,265) |  | ¥ (300,786) | ¥ (245,858)

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