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Principal Activities and Organization - Summary of Group's Consolidated Financial Statements (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2021
USD ($)
Jan. 01, 2019
CNY (¥)
Current assets            
Cash and cash equivalents ¥ 11,341,758   ¥ 3,998,203 ¥ 407,355 $ 1,779,769  
Short-term investments 884,996   536,401   138,875  
Accounts receivable 1,002   6,999   157  
Amounts due from related parties 6,615   40,799   1,038  
Prepayments and other current assets 724,583   164,910   113,703  
Total current assets 12,958,954   4,747,312   2,033,542  
Non-current assets            
Property, equipment and software, net 369,126   191,355   57,924  
Intangible assets, net 458   549   72  
Right-of-use assets, net 309,085   144,063   48,502 ¥ 50,570
Other non-current assets 4,000       628  
Total non-current assets 682,669   335,967   107,126  
Total assets 13,641,623   5,083,279   2,140,668  
Current liabilities            
Accounts payable 52,963   41,856   8,311  
Deferred revenue 1,958,570   1,200,349   307,342  
Other payables and accrued liabilities 645,138   418,259   101,236  
Operating lease liabilities, current 127,531   59,559   20,012  
Total current liabilities 2,784,202   1,720,023   436,901  
Non-current liabilities            
Operating lease liabilities, non-current 183,365   76,373   28,774  
Total liabilities 2,967,567   1,796,396   $ 465,675  
Total revenues 4,259,128 $ 668,350 1,944,359 998,720    
Cost of revenues (554,648) (87,036) (240,211) (137,812)    
Net loss (1,071,074) (168,074) (941,895) (502,055)    
Net cash (used in)/generated from operating activities 1,641,381 257,568 395,911 (105,663)    
Net cash used in investing activities (601,862) (94,445) 467,305 (1,223,803)    
Net cash generated from/(used in) financing activities 6,431,263 1,009,206 2,882,112 993,475    
Net increase in cash and cash equivalents 7,343,555 1,152,364 3,590,848 (292,878)    
Cash and cash equivalents at beginning of the year 3,998,203 627,405 407,355 700,233    
Cash and cash equivalents at end of the year 11,341,758 $ 1,779,769 3,998,203 407,355    
Variable Interest Entity, Primary Beneficiary [Member]            
Current assets            
Cash and cash equivalents 864,851   183,199 61,096    
Short-term investments 864,557   525,506      
Accounts receivable 1,002   6,999      
Amounts due from Group companies 86,989   36,859      
Amounts due from related parties 6,615   0      
Prepayments and other current assets 487,598   146,244      
Total current assets 2,311,612   898,807      
Non-current assets            
Property, equipment and software, net 368,381   191,242      
Intangible assets, net 458   549      
Right-of-use assets, net 301,288   144,063      
Other non-current assets 4,000   0      
Total non-current assets 674,127   335,854      
Total assets 2,985,739   1,234,661      
Current liabilities            
Accounts payable 52,938   41,839      
Deferred revenue 1,958,570   1,200,349      
Other payables and accrued liabilities 626,151   415,273      
Amounts due to Group companies 27,223   372,427      
Operating lease liabilities, current 124,464   59,559      
Total current liabilities 2,789,346   2,089,447      
Non-current liabilities            
Operating lease liabilities, non-current 178,844   76,373      
Total liabilities 2,968,190   2,165,820      
Total revenues 4,259,128   1,944,359 998,720    
Cost of revenues (554,575)   (232,261) (133,553)    
Net loss 551,133   (303,061) (464,373)    
Net cash (used in)/generated from operating activities 1,717,104   494,187 (25,658)    
Net cash used in investing activities (591,213)   (632,568) (66,029)    
Net cash generated from/(used in) financing activities (444,239)   260,484 103,596    
Net increase in cash and cash equivalents 681,652   122,103 11,909    
Cash and cash equivalents at beginning of the year 183,199   61,096 49,187    
Cash and cash equivalents at end of the year ¥ 864,851   ¥ 183,199 ¥ 61,096