v3.26.1
Acquisitions - Assets acquired and liabilities assumed (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Jul. 31, 2024
USD ($)
Jul. 31, 2024
CNY (¥)
May 20, 2024
USD ($)
May 20, 2024
CNY (¥)
Jan. 31, 2024
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
May 20, 2024
CNY (¥)
Jan. 31, 2024
CNY (¥)
Asset Acquisition [Line Items]                  
Goodwill           $ 3,686 $ 3,504 [1]    
Deferred tax liability           (1,689) $ (2,056)    
Dongjun Group                  
Asset Acquisition [Line Items]                  
Cash     $ 51         ¥ 374  
Prepayments and other current assets     110            
Inventories     966            
Notes receivable     603            
Property and equipment, net     1,776            
Intangible assets, net     99            
Goodwill     3,522            
Short-term borrowings     (978)            
Accounts payable - third parties     (3,783)            
Accrued expenses and other current liabilities     (436)            
Carrying value of existing investment     (2,865)            
Gain on equity method investment derecognized     (161)            
Amount of cash consideration     3,230 ¥ 23,500          
Fair value of assets acquired and liabilities assumed excluding cash     2,696            
Fair value of derecognized investment     (3,039) ¥ (22,200)          
Payment to acquire business $ (1,616) ¥ (11,750) (1,614)     $ (1,614)      
Consideration paid     1,565            
Dongjun Group | Nonrelated Party                  
Asset Acquisition [Line Items]                  
Accounts receivable - third parties, net     $ 4,326            
Suzhou Photon-Matrix                  
Asset Acquisition [Line Items]                  
Cash         $ 156       ¥ 1,121
Fair value of assets acquired and liabilities assumed excluding cash         13,907        
Fair value of derecognized investment         (4,855)        
Noncontrolling interest         2,002        
Deferred tax liability         (4,788)        
Consideration paid         $ 6,266        
[1] Restated (refer to Note 2(c))