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Additional Information of the Parent Company - Condensed Balance Sheets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Assets          
Cash and cash equivalents ¥ 1,554,583 $ 218,958 ¥ 913,277 ¥ 449,352  
Short-term investments 1,586,005 223,384 945,865    
Prepayments and other current assets 208,082 29,308 126,452    
Property and equipment, net 871,611 122,764 504,953    
TOTAL ASSETS 5,662,543 797,553 3,839,396    
Liabilities, Mezzanine Equity and Shareholders' (Deficit) Equity          
Accrued expenses and other current liabilities 498,324 70,188 356,502    
TOTAL LIABILITIES 1,800,225 253,557 997,663    
Mezzanine Equity:          
Redeemable shares (US$0.0001 par value, 54,551,513 and nil shares issued and outstanding as of December 31, 2022 and December 31, 2023, respectively) 0 0 5,986,910    
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]          
Additional paid-in capital 7,423,862 1,045,629 0    
Subscription receivables (292,721) (41,229) (310,227)    
Accumulated other comprehensive (loss) income 38,440 5,414 (3,608)    
Accumulated deficit (3,307,349) (465,830) (2,831,381)    
Total shareholders' (deficit) equity 3,862,318 543,996 (3,145,177) ¥ (2,490,670) ¥ 1,137,193
Total Liabilities, Mezzanine Equity and Shareholders' (Deficit) Equity 5,662,543 797,553 3,839,396    
Class A          
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]          
Ordinary shares 19 3 19    
Class B          
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]          
Ordinary shares 67 9 20    
Parent company | Reportable legal entities          
Assets          
Cash and cash equivalents 363,778 51,237 35,411    
Short-term investments 581,962 81,968      
Prepayments and other current assets 8,005 1,127 1,041    
Investments in subsidiaries 2,929,800 412,653 2,806,201    
Property and equipment, net 5 1 7    
TOTAL ASSETS 3,883,550 546,986 2,842,660    
Liabilities, Mezzanine Equity and Shareholders' (Deficit) Equity          
Amounts due to subsidiaries ¥ 14,024 $ 1,975      
Other Liability, Related Party, Type [Extensible Enumeration] srt:SubsidiariesMember srt:SubsidiariesMember      
Accrued expenses and other current liabilities ¥ 7,208 $ 1,015 927    
TOTAL LIABILITIES 21,232 2,990 927    
Mezzanine Equity:          
Redeemable shares (US$0.0001 par value, 54,551,513 and nil shares issued and outstanding as of December 31, 2022 and December 31, 2023, respectively)     5,986,910    
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]          
Additional paid-in capital 7,423,862 1,045,629      
Subscription receivables (292,721) (41,229) (310,227)    
Accumulated other comprehensive (loss) income 38,440 5,414 (3,608)    
Accumulated deficit (3,307,349) (465,830) (2,831,381)    
Total shareholders' (deficit) equity 3,862,318 543,996 (3,145,177)    
Total Liabilities, Mezzanine Equity and Shareholders' (Deficit) Equity 3,883,550 546,986 2,842,660    
Parent company | Reportable legal entities | Class A          
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]          
Ordinary shares 19 3 19    
Parent company | Reportable legal entities | Class B          
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]          
Ordinary shares ¥ 67 $ 9 ¥ 20