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Significant Accounting Policies - Additional information (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2020
USD ($)
$ / ¥
Dec. 31, 2020
CNY (¥)
$ / ¥
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2017
CNY (¥)
Related Party Transaction [Line Items]                
Exchange rate (US$1.00) | $ / ¥       6.5250 6.5250      
Cash at bank and demand deposits       $ 8,200 ¥ 53,200 $ 15,600 ¥ 109,100  
Cash and cash equivalents     ¥ 578,558 16,845 109,916 $ 29,720 193,920 ¥ 66,695
Time deposits       7,000 45,674   69,762  
Restricted cash       4,571 29,829   1,529  
Depreciation methods straight-line method              
Impairment loss ¥ 0              
Goodwill       17,688 115,414      
Impairment charges 0              
Advertising and promotional expenses 156,600 ¥ 291,200 238,000          
Employee benefits ¥ 13,401 ¥ 39,152 24,610          
Total non-current assets       48 313   7,577  
operating lease ROU assets       1,655 10,801      
Operating lease liabilities       1,526 9,959      
Short-term operating lease liabilities (including short-term operating lease liabilities of the consolidated variable interest entities ("VIEs") without recourse to the primary beneficiary of nil and RMB1,025 as of December 31, 2019 and 2020, respectively)       906 5,911      
Long-term operating lease liabilities       $ 620 4,048      
Accounting Standards Update 2016-02 [Member]                
Related Party Transaction [Line Items]                
operating lease ROU assets         10,800      
Operating lease liabilities         9,900      
Short-term operating lease liabilities (including short-term operating lease liabilities of the consolidated variable interest entities ("VIEs") without recourse to the primary beneficiary of nil and RMB1,025 as of December 31, 2019 and 2020, respectively)         5,900      
Long-term operating lease liabilities         4,000      
Other non-current assets                
Related Party Transaction [Line Items]                
Upfront issuance costs     700   0   0  
PRC subsidiaries, VIEs                
Related Party Transaction [Line Items]                
Cash and cash equivalents         ¥ 63,400   ¥ 91,900  
Percentage of cash and cash equivalents held y subsidiaries 57.70% 47.40%            
Employee benefits ¥ 13,400 ¥ 39,200 ¥ 24,600