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v3.25.1

Acquisitions - Assets acquired and liabilities assumed (Details) ¥ in Thousands, $ in Thousands | Mar. 31, 2025 CNY (¥) | Jul. 31, 2024 CNY (¥) | May 20, 2024 CNY (¥) | Jan. 31, 2024 CNY (¥) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | May 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | ¥ 25,727 | $ 3,525 |  | ¥ 0
Dongjun Group |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash |  |  | ¥ 374 |  |  |  |  |
Prepayments and other current assets |  |  | 801 |  |  |  |  |
Inventories |  |  | 7,054 |  |  |  |  |
Notes receivable |  |  | 4,401 |  |  |  |  |
Property and equipment, net |  |  | 12,974 |  |  |  |  |
Intangible assets, net |  |  | 724 |  |  |  |  |
Goodwill |  |  | 25,727 |  |  |  |  |
Short-term borrowings |  |  | (7,140) |  |  |  |  |
Accounts payable - third parties |  |  | (27,634) |  |  |  |  |
Accrued expenses and other current liabilities |  |  | (3,183) |  |  |  |  |
Carrying value of existing investment |  |  | (21,026) |  |  |  |  |
Gain on equity method investment derecognized |  |  | (1,174) |  |  |  |  |
Amount of cash consideration |  |  | 23,500 |  |  |  |  |
Fair value of assets acquired and liabilities assumed excluding cash |  |  | 19,599 |  |  |  |  |
Fair value of derecognized investment |  |  | (22,200) |  |  |  |  |
Payment to acquire business |  | ¥ (11,750) |  | ¥ (11,750) |  |  |  |
Consideration paid |  |  |  |  |  |  | ¥ 11,376 |
Dongjun Group | Forecast |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |
Payment to acquire business | ¥ (11,750) |  |  |  |  |  |  |
Dongjun Group | Nonrelated Party |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable - third parties, net |  |  | ¥ 31,602 |  |  |  |  |
Suzhou Photon-Matrix |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash |  |  |  | 1,121 |  |  |  |
Fair value of assets acquired and liabilities assumed excluding cash |  |  |  | 100,002 |  |  |  |
Fair value of derecognized investment |  |  |  | (34,829) |  |  |  |
Noncontrolling interest |  |  |  | 14,360 |  |  |  |
Consideration paid |  |  |  | ¥ 45,185 |  |  |  |

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