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Significant Accounting Policies - Additional information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Number
shares
Dec. 31, 2021
CNY (¥)
$ / shares
Dec. 31, 2020
CNY (¥)
Number
shares
Dec. 31, 2020
CNY (¥)
$ / shares
Dec. 31, 2019
CNY (¥)
Dec. 31, 2021
USD ($)
Jan. 01, 2020
CNY (¥)
Disclosure of Accounting Policies [Line Items]              
Exchange rate 6.3726 6.3726       6.3726  
Restricted cash ¥ 4,155 ¥ 4,155 ¥ 3,695 ¥ 3,695   $ 652  
Number of lien arrangements | Number 0   0        
Weighted average contract period 117 days   124 days   97 days    
Recognized revenue ¥ 11,000   ¥ 9,900   ¥ 8,900    
Revenue remaining performance obligation 0 0 0 0 0    
Contract assets 0 0 0 0 0    
Advertising and promotional expenses 360,200   127,400   191,100    
Employee benefit expenses ¥ 57,200   38,500   36,000    
Income tax examination likelihood of settlement The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement.            
Unrecognized uncertain tax positions ¥ 0 ¥ 0 0 0 0    
Annual appropriation to reserve percent 10.00% 10.00%       10.00%  
Threshold limit for reserve appropriation 50.00% 50.00%       50.00%  
Appropriation to statutory reserves ¥ 0   0   0    
Cash and cash equivalents 533,293 ¥ 533,293 315,459 315,459   $ 83,700  
Lease liabilities 31,005 31,005 4,296 4,296     ¥ 11,700
Finance lease 0 0 0 0      
Operating lease liabilities, current 13,929 13,929 3,709 3,709   2,186 8,300
Operating lease liabilities, non-current 17,076 17,076 587 587   $ 2,680 ¥ 3,400
Investment income from its short term investments ¥ 500 ¥ 500 ¥ 1,200 ¥ 1,200 ¥ 0    
Finance Lease, Liability, Statement of Financial Position [Extensible List] Finance lease Finance lease Finance lease Finance lease   Finance lease  
Share option granted | shares 0   0        
Exercise price of fair value grant date price | $ / shares   ¥ 0   ¥ 0      
Alipay and WeChat Pay [Member]              
Disclosure of Accounting Policies [Line Items]              
Cash and cash equivalents ¥ 11,300 ¥ 11,300 ¥ 11,600 ¥ 11,600      
Subsidiaries [Member]              
Disclosure of Accounting Policies [Line Items]              
Cash and cash equivalents ¥ 237,800 ¥ 237,800 ¥ 152,000 ¥ 152,000      
Cash And Cash Equivalents Total [Member] | Subsidiaries [Member]              
Disclosure of Accounting Policies [Line Items]              
Concentration risk percentage     48.20% 48.20%      
Cash And Cash Equivalents Total [Member] | VIE [Member]              
Disclosure of Accounting Policies [Line Items]              
Concentration risk percentage 44.60% 44.60%       44.60%  
Bank Balance [Member]              
Disclosure of Accounting Policies [Line Items]              
Restricted cash ¥ 4,200 ¥ 4,200          
Credit Card [Member]              
Disclosure of Accounting Policies [Line Items]              
Restricted cash 1,200 1,200          
Local Authorities [Member]              
Disclosure of Accounting Policies [Line Items]              
Restricted cash ¥ 3,000 ¥ 3,000