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Significant Accounting Policies - Summary Financial Information of VIEs and their Subsidiaries (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Variable Interest Entity [Line Items]        
Cash, cash equivalents and restricted cash ¥ 753,642 ¥ 626,715   $ 109,268
Short-term investments 70,542 184,159   10,228
Prepaid expenses and other current assets 98,272 176,349   14,248
Total current assets 969,104 1,126,584   140,507
Right-of-use assets 274,643 362,335   39,819
Total non-current assets 1,306,966 1,466,036   189,491
TOTAL ASSETS 2,276,070 2,592,620   329,998
Accrued expenses and other current liabilities 436,339 586,043   63,263
Deferred revenue, current (including deferred revenue, current of the consolidated VIEs without recourse to Sunlands Technology Group of RMB295,958 and RMB374,208 as of December 31, 2021 and 2022, respectively) 986,086 1,266,948   142,969
Lease liabilities, current 17,065 14,310   2,474
Total current liabilities 1,478,144 1,905,955   214,310
Deferred revenue, non-current (including deferred revenue, non-current of the consolidated VIEs without recourse to Sunlands Technology Group of RMB257,071 and RMB251,080 as of December 31, 2021 and 2022, respectively) 704,860 1,081,231   102,195
Lease liabilities, non-current 316,844 404,133   45,938
TOTAL LIABILITIES 2,655,921 3,606,772   $ 385,072
Net revenues 1,076,379 537,273 ¥ 1,042,693  
Net (loss)/income 376,082 (183,346) (446,621)  
Net cash (used in)/generated from operating activities 502,168 (514,536) (1,663,110)  
Net cash (used in)/generated from investing activities (11,166) 177,164 ¥ (214,045)  
VIEs        
Variable Interest Entity [Line Items]        
Cash, cash equivalents and restricted cash 152,215 64,896    
Short-term investments 68,440 59,105    
Prepaid expenses and other current assets 47,948 54,235    
Total current assets 284,328 208,932    
Right-of-use assets 274,643 291,492    
Total non-current assets 617,828 660,990    
TOTAL ASSETS 902,156 869,922    
Accrued expenses and other current liabilities 191,172 197,467    
Deferred revenue, current (including deferred revenue, current of the consolidated VIEs without recourse to Sunlands Technology Group of RMB295,958 and RMB374,208 as of December 31, 2021 and 2022, respectively) 374,208 295,958    
Lease liabilities, current 17,065 8,366    
Total current liabilities 582,445 501,791    
Deferred revenue, non-current (including deferred revenue, non-current of the consolidated VIEs without recourse to Sunlands Technology Group of RMB257,071 and RMB251,080 as of December 31, 2021 and 2022, respectively) 251,080 257,071    
Lease liabilities, non-current 316,844 318,598    
TOTAL LIABILITIES ¥ 1,152,554 ¥ 1,080,735