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Additional Information of the Parent Company - Condensed Statements of Cash Flows (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Cash flows from operating activities:        
Net loss ¥ (475,968) $ (67,039) ¥ (300,765) ¥ (244,827)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation and amortization 86,268 12,151 53,634 28,231
Loss from equity in earnings of subsidiaries 45 6 45 84
Share-based compensation 234,624 33,046 105,219 54,283
Fair value change of short-term investments (15,095) (2,126) 4,878 (7,717)
Foreign exchange loss (gain), net (9) (1) (5,868) 10,945
Changes in operating assets and liabilities:        
Prepayments and other current assets (82,646) (11,640) (33,556) (48,618)
Amounts due from related parties       24,788
Accrued expenses and other current liabilities 80,297 11,310 (41,074) 170,125
Net cash used in operating activities 57,261 8,065 (696,015) (228,386)
Cash flows from investing activities:        
Purchases of short-term investments (5,100,868) (718,442) (5,586,764) (4,812,942)
Maturity of short-term investments 4,479,302 630,896 6,978,764 3,114,287
Purchases of property and equipment (406,748) (57,289) (231,210) (220,096)
Investments in subsidiaries (17,506)      
Net cash used in investing activities (1,060,393) (149,354) 1,119,646 (1,980,237)
Cash flows from financing activities:        
Cash contribution from shareholders in connection with the 2021 Reorganization 17,506 2,466   507,620
Proceeds from issuance of convertible loans       1,950,338
Proceeds from issuance of ordinary shares 1,225,470 172,604   453,978
Payment of offering costs (22,828) (3,215) (3,296)  
Proceeds from issuance of ordinary shares upon the exercise of share options 2,872 405    
Net cash provided by financing activities 1,590,356 223,998 15,176 2,403,726
Net increase (decrease) in cash and cash equivalents 587,224 82,709 438,807 195,103
Cash, cash equivalents and restricted cash, beginning of the year 913,277 128,632 449,352 256,688
Effect of foreign exchange rate changes on cash and cash equivalents 57,623 8,116 25,118 (2,439)
Cash, cash equivalents and restricted cash, end of the year 1,558,124 219,457 913,277 449,352
Supplemental disclosure of non-cash financing activities:        
Accrued purchases of property and equipment 179,839 25,330 102,181 114,446
Accrued offering cost     480  
Parent company | Reportable legal entities        
Cash flows from operating activities:        
Net loss (475,968) (67,039) (300,765) (244,827)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation and amortization 3 1 2  
Loss from equity in earnings of subsidiaries 420,259 59,192 263,662 95,699
Share-based compensation 42,379 5,969 33,342 35,056
Fair value change of short-term investments (12,500) (1,761)    
Foreign exchange loss (gain), net 12 2 (2) 2,324
Changes in operating assets and liabilities:        
Prepayments and other current assets (1,544) (217) (545) (496)
Amounts due from related parties       (255)
Accrued expenses and other current liabilities 6,281 885 2,611 24,746
Net cash used in operating activities (21,078) (2,968) (1,695) (87,753)
Cash flows from investing activities:        
Purchases of short-term investments (742,287) (104,552)    
Maturity of short-term investments 176,302 24,832    
Purchases of property and equipment     (10)  
Investments in subsidiaries (379,237) (53,414)   (2,787,570)
Net cash used in investing activities (945,222) (133,134) (10) (2,787,570)
Cash flows from financing activities:        
Cash contribution from shareholders in connection with the 2021 Reorganization 17,506 2,466   507,620
Proceeds from issuance of convertible loans       1,950,338
Proceeds from issuance of ordinary shares 1,225,470 172,604   453,978
Payment of offering costs (22,828) (3,215)    
Proceeds from issuance of ordinary shares upon the exercise of share options 2,872 405    
Collection of payments due to subsidiaries 14,024 1,975    
Net cash provided by financing activities 1,237,044 174,235   2,911,936
Net increase (decrease) in cash and cash equivalents 270,744 38,133 (1,705) 36,613
Cash, cash equivalents and restricted cash, beginning of the year 35,411 4,988 36,160  
Effect of foreign exchange rate changes on cash and cash equivalents 57,623 8,116 956 (453)
Cash, cash equivalents and restricted cash, end of the year ¥ 363,778 $ 51,237 35,411 36,160
Supplemental disclosure of non-cash financing activities:        
Accrued purchases of property and equipment       ¥ 1,950,338
Accrued offering cost     ¥ 480