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Summary of Significant Accounting Policies - Additional Information (Details)
¥ in Thousands
12 Months Ended
Mar. 01, 2017
shares
Dec. 31, 2022
CNY (¥)
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Sep. 15, 2022
USD ($)
Dec. 31, 2021
USD ($)
Nov. 20, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]                  
Foreign currency exchange rate   6.8972       6.8972      
Finite lived intangible asset residual value | ¥   ¥ 0              
Revenue Recognized   67,419 $ 9,775,000 ¥ 62,790          
Unsatisfied performance obligation   37,818   42,019   $ 5,483,000      
Impairment of long-term investments   6,726 975,000 25,370 ¥ 38,739        
Non cash impairment loss on long term investments   6,726 975,000 25,370 39,181        
Non Cash Impairment Loss On Long Term Investments   705 102,000 528 4,500        
Impairment of long-lived assets other than goodwill   ¥ 22,400 $ 3,248,000 0 10,952        
Value added tax percentage   6.00% 6.00%            
Share repurchased cash consideration | ¥   ¥ 1,689              
Advertising expenses   6,460 $ 937,000 12,767 9,789        
Employee defined contribution plan expense incurred   ¥ 16,379 $ 2,375,000 16,714 10,556        
Depreciation of the US$ against RMB, percent   8.23% 8.23%            
Revenues   ¥ 328,822 $ 47,675,000 357,322 ¥ 471,614        
Operating lease right-of-use assets   33,756   ¥ 0   4,894,000      
Impairment charge of goodwill | ¥   0              
Land [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Operating lease right-of-use assets   ¥ 21,560       3,126,000      
Supplier Concentration Risk | Suppliers | Three Suppliers [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Concentration risk, percentage   50.20% 50.20%            
Product Concentration Risk | Suppliers | Three Suppliers [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Concentration risk, percentage       46.40% 71.00%        
CHINA                  
Summary Of Significant Accounting Policies [Line Items]                  
Cash and cash equivalents, restricted cash and short-term investments   ¥ 108,579   ¥ 276,644   15,742,000      
Outside China                  
Summary Of Significant Accounting Policies [Line Items]                  
Cash and cash equivalents, restricted cash and short-term investments   ¥ 7,681       $ 1,114,000   $ 2,186,000  
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 | Two Thousand Twenty Two Repurchase Plan [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Share repurchased under repurchase plan | shares   273,469 273,469            
Share repurchased cash consideration   ¥ 1,689 $ 245,000            
American Depositary Shares | Maximum                  
Summary Of Significant Accounting Policies [Line Items]                  
Share repurchase plan, authorized amount | $                 $ 10,000,000
American Depositary Shares | Maximum | Two Thousand Twenty Two Repurchase Plan [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Share repurchase plan, authorized amount | $             $ 5,000,000    
Class A Common Shares                  
Summary Of Significant Accounting Policies [Line Items]                  
Share repurchased under repurchase plan | shares 613,737                
Class A Common Shares | Two Thousand Twenty Two Repurchase Plan [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Share repurchased under repurchase plan | shares 182,313 182,313 182,313