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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%

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