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v3.24.1

Income taxes - Principal components of the deferred tax assets and liabilities (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |  |  |
Inventories | ¥ 3,006 |  | ¥ 7,654 |  |  |
Allowance for doubtful accounts | 2,089 |  | 2,049 |  |  |
Intangible assets | 218,328 |  | 268,381 |  |  |
Property and equipment | $ |  | $ 1,093 |  | $ 0 |  |
Contract cost assets | $ |  | $ 6,966 |  | $ 0 |  |
Accrued product warranties | 19,883 |  | 23,037 |  |  |
Accrued salaries and benefits | 2,360 |  | 10,961 |  |  |
Accrued expenses and other liabilities | 20,340 |  | 14,494 |  |  |
Unrealized investment loss of equity method investments | 0 |  | 7,326 |  |  |
Donation | 302 |  | 503 |  |  |
Government grants | 12,198 |  | 0 |  |  |
Operating lease liabilities | 26,634 |  | 22,781 |  |  |
Net operating loss carryforwards | 303,198 |  | 201,812 |  |  |
Total deferred tax assets | 616,397 |  | 558,998 |  |  |
Less: valuation allowance | (582,644) |  | (537,172) |  | ¥ (550,520) | ¥ (362,371)
Deferred tax assets, net of valuation allowance | 33,753 |  | 21,826 |  |  |
Deferred tax liabilities: |  |  |  |  |  |
Operating lease right-of-use assets | (23,904) |  | (21,826) |  |  |
Property and equipment | (1,580) |  | 0 |  |  |
Unrealized investment gain of equity method investments | (8,151) |  | 0 |  |  |
Total deferred tax liabilities | (33,635) |  | (21,826) |  |  |
Net deferred tax assets | ¥ 118 |  | ¥ 0 |  |  |

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