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Summary of Significant Accounting Policies - Additional Information (Details)
12 Months Ended
Mar. 01, 2017
shares
Dec. 31, 2021
CNY (¥)
Segment
Supplier
shares
Dec. 31, 2021
USD ($)
Segment
Supplier
shares
Dec. 31, 2020
CNY (¥)
Supplier
shares
Dec. 31, 2019
CNY (¥)
Supplier
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 20, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]                
Foreign currency exchange rate   6.3726       6.3726    
Finite lived intangible asset residual value   ¥ 0            
Revenue Recognized   62,790,000 $ 9,853,000 ¥ 34,449,000        
Unsatisfied performance obligation   42,019,000   31,951,000   $ 6,594,000    
Impairment of long-term investments   25,370,000 3,981,000 38,739,000 ¥ 0      
Non cash impairment loss on long term investments   25,370,000 3,981,000 39,181,000        
Non Cash Impairment Loss On Long Term Investments   528,000 $ 83,000 4,500,000        
Impairment of long-lived assets other than goodwill   ¥ 0   10,952,000 0      
Value added tax percentage   6.00% 6.00%          
Share repurchased cash consideration         37,559,000      
Research and development cost, capitalized   ¥ 0            
Advertising expenses   ¥ 12,767,000 $ 2,003,000 9,789,000 17,311,000      
Profit sharing program, recognized period   5 years 5 years          
Capital leases   ¥ 0            
Employee defined contribution plan expense incurred   ¥ 16,714,000 $ 2,623,000 10,556,000 20,724,000      
Depreciation of the US$ against RMB, percent   2.34% 2.34%          
Number of reportable segment | Segment   1 1          
Revenues   ¥ 357,322,000 $ 56,072,000 ¥ 471,614,000 ¥ 906,458,000      
Supplier Concentration Risk | Suppliers | Three Suppliers [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Concentration risk, percentage   46.40% 46.40%          
Product Concentration Risk | Suppliers | Three Suppliers [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Concentration risk, percentage       71.00% 57.70%      
Advertising                
Summary Of Significant Accounting Policies [Line Items]                
Number of suppliers | Supplier   3 3 3 3      
CHINA                
Summary Of Significant Accounting Policies [Line Items]                
Cash and cash equivalents, restricted cash and short-term investments   ¥ 276,644,000   ¥ 322,183,000   43,412,000    
Outside China                
Summary Of Significant Accounting Policies [Line Items]                
Cash and cash equivalents, restricted cash and short-term investments   ¥ 13,927,000       $ 2,186,000 $ 17,494,000  
Maximum                
Summary Of Significant Accounting Policies [Line Items]                
Revenues | $     $ 1,070,000,000.00          
Maximum | Product Concentration Risk | Suppliers                
Summary Of Significant Accounting Policies [Line Items]                
Concentration risk, percentage   50.00% 50.00%          
American Depositary Shares                
Summary Of Significant Accounting Policies [Line Items]                
Share repurchased under repurchase plan | shares   920,606 920,606          
Share repurchased cash consideration | $     $ 5,910,000          
American Depositary Shares | Maximum                
Summary Of Significant Accounting Policies [Line Items]                
Share repurchase plan, authorized amount | $               $ 10,000,000
Class A Common Shares                
Summary Of Significant Accounting Policies [Line Items]                
Share repurchased under repurchase plan | shares 613,737 613,737 613,737 613,737 613,737