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Organization and Reorganization (Detail Textuals)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Nov. 20, 2018
CNY (¥)
shares
Nov. 20, 2018
USD ($)
$ / shares
shares
Sep. 28, 2018
USD ($)
Jul. 27, 2018
USD ($)
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
CAD ($)
Dec. 31, 2018
USD ($)
Subsidiary, Sale of Stock [Line Items]                    
Proceeds of initial public offering, net of issuance costs         ¥ 103,372 $ 15,034        
Threshold limit for value of asset under the agreement | ¥         100,000          
Variable interest entity registered capital | ¥         10,000   ¥ 10,000      
Net loss         78,700   90,700   $ 86,600  
Net cash used in operating activities         (53,338) $ (7,756) (59,662) ¥ (54,092)    
Accumulated deficit         ¥ (468,026)   ¥ (389,326)     $ (68,072)
Beijing Z-Park Fund Investment Center (Limited Partner) ("Beijing Z-Park Fund")                    
Subsidiary, Sale of Stock [Line Items]                    
Proceeds of initial public offering, net of issuance costs | $     $ 50,000              
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 ¥ 103,400 $ 15,000                
Series D-2 preferred shares | Beijing Z-Park Fund Investment Center (Limited Partner) ("Beijing Z-Park Fund")                    
Subsidiary, Sale of Stock [Line Items]                    
Preferred shares financing amount | $       $ 50,000            
Preferred shares acquired in purchase agreement       20,630,925            
Series D-2 preferred shares | Beijing Shengjing Fengtai Innovation Investment Center (Limited Partner) ("Beijing Shengjing Fengtai Innovation")                    
Subsidiary, Sale of Stock [Line Items]                    
Preferred shares financing amount | $       $ 2,300            
Preferred shares acquired in purchase agreement       949,023            
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