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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