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Significant Accounting Policies - Additional Information (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
CNY (¥)
PerformanceObligation
$ / ¥
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
$ / ¥
Significant Accounting Policies [Line Items]        
Sale or purchase of assets or rights minimum amount ¥ 50      
Option agreement maximum contract amount ¥ 50      
Aggregate percentage of variable interest entity assets on Group's consolidated total assets 39.60% 33.60%   39.60%
Aggregate percentage of variable interest entity liabilities on Group's consolidated total liabilities 43.40% 30.00%   43.40%
Consolidated VIE assets ¥ 2,276,070 ¥ 2,592,620   $ 329,998
Consolidated VIE creditor ¥ 2,655,921 3,606,772   $ 385,072
Currency exchange rate, Renminbi ("RMB") to U.S. dollar | $ / ¥ 6.8972     6.8972
Rate of VAT 6.00%      
Rate of VAT, simple VAT collection method 3.00%      
Advertising expenses ¥ 484,442 792,926 ¥ 1,090,933  
Cash and cash equivalents available for conversion to foreign currency ¥ 248,617 ¥ 123,360    
Percentage of cash and cash equivalents available for conversion to foreign currency 33.00% 19.70%   33.00%
Total Net Revenues | Customer Concentration Risk | Customer        
Significant Accounting Policies [Line Items]        
Revenues from customers individually representing portion of total net revenues 10.00%      
Other Income        
Significant Accounting Policies [Line Items]        
Government subsidies ¥ 3,697 ¥ 30,501 ¥ 37,727  
ASU 2018-11        
Significant Accounting Policies [Line Items]        
Change In accounting principle accounting standards update adopted true     true
Change in accounting principle accounting standards update adoption date Jan. 01, 2019     Jan. 01, 2019
Practical expedients, package true      
Degree- or Diploma-oriented Post-secondary Courses        
Significant Accounting Policies [Line Items]        
Weighted average service period 21 months      
Professional Certification Preparation, Professional Skills and Interest Courses        
Significant Accounting Policies [Line Items]        
Weighted average service period 7 months      
Online Education Service and Insurance Service [Member]        
Significant Accounting Policies [Line Items]        
Number of performance obligation | PerformanceObligation 2      
VIEs        
Significant Accounting Policies [Line Items]        
Consolidated VIE assets ¥ 902,156 869,922    
Consolidated VIE creditor 1,152,554 ¥ 1,080,735    
VIEs | Nonrecourse        
Significant Accounting Policies [Line Items]        
Consolidated VIE creditor 0      
VIEs | Assets Pledged as Collateral        
Significant Accounting Policies [Line Items]        
Consolidated VIE assets ¥ 0      
Minimum        
Significant Accounting Policies [Line Items]        
Term of repayment of principal installments on which interest expense and service fees payable 3 months      
Maximum        
Significant Accounting Policies [Line Items]        
Time for full refund of transaction price 24 hours      
Time for refund of transaction price to undelivered courses 7 days      
Term of repayment of principal installments on which interest expense and service fees payable 18 months      
WFOE | Minimum        
Significant Accounting Policies [Line Items]        
Ownership percentage by parent 10.00%     10.00%
WFOE | Maximum        
Significant Accounting Policies [Line Items]        
Ownership percentage by parent 100.00%     100.00%