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Consolidated Statements of Changes in Shareholders' (Deficit)/Equity
¥ in Thousands, $ in Thousands
CNY (¥)
shares
USD ($)
shares
Ordinary shares [Member]
CNY (¥)
shares
Treasury stock [Member]
CNY (¥)
shares
Additional Paid-in Capital [Member]
CNY (¥)
Accumulated other comprehensive income/(loss) [Member]
CNY (¥)
Accumulated deficit [Member]
CNY (¥)
Beginning balance, shares at Dec. 31, 2018 | shares     260,000,000 0      
Beginning balance at Dec. 31, 2018 ¥ (925,959)   ¥ 171 ¥ 0 ¥ 0 ¥ 3,758 ¥ (929,888)
Statement [Line Items]              
Net loss (132,957)           (132,957)
Preferred shares redemption value accretion ¥ (940,186)           (940,186)
Issuance of treasury stock for grants of restricted shares | shares     25,428,430 (25,428,430)      
Issuance of treasury stock for grants of restricted shares     ¥ 18 ¥ (18)      
Vesting of restricted share units, shares | shares 0 0          
Foreign currency translation adjustment ¥ 671         671  
Ending balance, shares at Dec. 31, 2019 | shares     285,428,430 (25,428,430)      
Ending balance at Dec. 31, 2019 (1,998,431)   ¥ 189 ¥ (18) 0 4,429 (2,003,031)
Statement [Line Items]              
Net loss (82,184)           (82,184)
Issuance of ordinary shares , shares | shares     82,000,000        
Issuance of ordinary shares 256,408   ¥ 56   256,352    
Conversion of preferred shares to ordinary shares upon the completion of the IPO shares 2,101,056   ¥ 391   2,100,665    
Preferred shares redemption value accretion (154,066)           (154,066)
Share-based payment compensation 49,170       49,170    
Issuance of treasury stock for grants of restricted shares ¥ 3,378       3,378    
Issuance of treasury stock for share incentive plan | shares     5,000,000 (5,000,000)      
Issuance of treasury stock for share incentive plan     ¥ 4 ¥ (4)      
Vesting of restricted shares, shares | shares       9,857,100      
Vesting of restricted shares       ¥ 8 (8)    
Vesting of restricted share units, shares | shares 190,160 190,160   190,160      
Vesting of restricted share units ¥ 196       196    
Exercise of options, shares | shares 3,235,000 3,235,000   3,235,100      
Exercise of options, value ¥ 2     ¥ 2      
Foreign currency translation adjustment (6,338)         (6,338)  
Ending balance, shares at Dec. 31, 2020 | shares     941,464,520 (17,146,070)      
Ending balance at Dec. 31, 2020 ¥ 169,191   ¥ 640 ¥ (12) 2,409,753 (1,909) (2,239,281)
Statement [Line Items]              
Conversion of preferred shares to ordinary shares upon the completion of the IPO shares, shares | shares 569,036,090 569,036,090 569,036,090        
Net loss ¥ (127,300) $ (19,969)         (127,250)
Issuance of ordinary shares , shares | shares     73,710,080        
Issuance of ordinary shares 183,188   ¥ 48   183,140    
Share-based payment compensation ¥ 34,715       34,715    
Issuance of treasury stock for share incentive plan | shares     15,002,660 (15,002,660)      
Issuance of treasury stock for share incentive plan     ¥ 10 ¥ (10)      
Vesting of restricted shares, shares | shares       6,232,100      
Vesting of restricted shares       ¥ 5 (5)    
Vesting of restricted share units, shares | shares 1,812,960 1,812,960   4,830,900      
Vesting of restricted share units ¥ 2,856     ¥ 3 2,853    
Exercise of options, shares | shares 4,925,000 4,925,000   4,924,720      
Exercise of options, value ¥ 3     ¥ 3      
Foreign currency translation adjustment (7,848) $ (1,232)       (7,848)  
Ending balance, shares at Dec. 31, 2021 | shares     1,030,177,260 (16,161,010)      
Ending balance at Dec. 31, 2021 ¥ 254,855 $ 39,993 ¥ 698 ¥ (11) ¥ 2,630,456 ¥ (9,757) ¥ (2,366,531)