v3.25.2
Redeemable Convertible Preferred Shares (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 6 Months Ended
Oct. 08, 2019
CNY (¥)
shares
Jun. 30, 2015
CNY (¥)
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 12, 2014
CNY (¥)
shares
Jun. 12, 2014
USD ($)
$ / shares
shares
Oct. 25, 2013
CNY (¥)
shares
Oct. 25, 2013
USD ($)
$ / shares
shares
Jun. 30, 2025
Item
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Redeemable Convertible Preferred Shares [Line Items]                      
Number of rounds of financing by issuing preferred shares (in Item) | Item               4      
Preferred share               150.00%      
Convertible ordinary share                 1 1 1
Liquidation preference, percentage of original issue price               150.00%      
Series A preferred shares [Member]                      
Redeemable Convertible Preferred Shares [Line Items]                      
Share issue           259,257,900 259,257,900        
Series A-1 preferred shares [Member]                      
Redeemable Convertible Preferred Shares [Line Items]                      
Share issue           111,110,000 111,110,000        
Shares repurchased   9,007,682 9,007,682                
Total consideration on shares repurchased   ¥ 42,000 $ 7,000                
Series A-2 preferred shares [Member]                      
Redeemable Convertible Preferred Shares [Line Items]                      
Share issue           148,147,900 148,147,900        
Share price (in Dollars per share) | $ / shares             $ 0.07        
Total consideration on shares issued           ¥ 58,980 $ 9,830        
Series B Preferred Shares [Member]                      
Redeemable Convertible Preferred Shares [Line Items]                      
Share issue       177,834,496 177,834,496            
Share price (in Dollars per share) | $ / shares         $ 0.25            
Total consideration on shares issued       ¥ 276,764 $ 45,000            
Outstanding share percentage               75.00%      
Series C Preferred Stock [Member]                      
Redeemable Convertible Preferred Shares [Line Items]                      
Share issue   286,959,017 286,959,017                
Share price (in Dollars per share) | $ / shares     $ 0.78                
Total consideration on shares issued   ¥ 1,364,046 $ 223,000                
Shares repurchased   29,596,670 29,596,670                
Total consideration on shares repurchased   ¥ 140,612 $ 23,000                
Greyhound Investment Ltd [Member]                      
Redeemable Convertible Preferred Shares [Line Items]                      
Options granted 172,908,894                    
Grant date fair value of stock options granted (in Yuan Renminbi) | ¥ ¥ 642,174