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Organization and Reorganization - Additional information (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended 13 Months Ended
Nov. 20, 2018
USD ($)
$ / shares
shares
Nov. 20, 2018
CNY (¥)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2018
CNY (¥)
Aug. 31, 2020
shares
Dec. 31, 2020
CNY (¥)
Subsidiary, Sale of Stock [Line Items]                
Offering 2,600,000 American Depositary Shares ("ADSs") issued and sold             80,000  
Proceeds of initial public offering, net of issuance costs | ¥           ¥ 103,372    
Variable interest entity registered capital | ¥         ¥ 10,000     ¥ 40,100
Net loss | ¥       ¥ (163,500) (251,300) (78,700)    
Net cash used in operating activities     $ (13,618) ¥ (88,854) (161,806) ¥ (53,338)    
Accumulated deficit     $ 135,126   ¥ 718,666     ¥ 881,700
Class A ordinary shares                
Subsidiary, Sale of Stock [Line Items]                
Number of initial public offering 2,600,000 2,600,000            
Offering 2,600,000 American Depositary Shares ("ADSs") issued and sold 10,400,000 10,400,000            
Share price per ADS | $ / shares $ 7.80              
Proceeds of initial public offering, net of issuance costs $ 15,000 ¥ 103,400            
Best Cars Limited ("Best Cars") | Class A ordinary shares                
Subsidiary, Sale of Stock [Line Items]                
Number of ordinary shares held     38,723,321 38,723,321 38,723,321