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Summary of Significant Accounting Policies - Additional Information (Details)
¥ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Customer
Segment
Dec. 31, 2023
USD ($)
Customer
Segment
Dec. 31, 2022
CNY (¥)
Segment
Customer
Dec. 31, 2021
CNY (¥)
Segment
Customer
Dec. 29, 2023
¥ / shares
Jan. 01, 2023
CNY (¥)
Jan. 01, 2022
CNY (¥)
Jan. 01, 2021
CNY (¥)
Summary Of Significant Accounting Policies [Line Items]                
Cash provided by or (used in) operating activities ¥ 243,898,000 $ 34,351 ¥ 881,297,000 ¥ (1,017,962,000)        
Cash provided by or (used in) investing activities 172,013,000 24,228 (516,683,000) (670,402,000)        
Cash provided by or (used in) financing activities 68,703,000 $ 9,677 (186,043,000) 2,289,623,000        
Calculated rate per share | ¥ / shares         ¥ 7.0999      
Write-down of inventory 45,749,000   8,931,000 2,595,000        
Property and equipment impairment loss 0   0 0        
Impairment long-lived assets       0        
Intangible assets impairment losses     206,925,000          
Goodwill impairment loss 0   1,819,926,000 0        
Unrealized gain (loss) from fair value changes of short term investments (1,303,000)   0 467,000        
Equity method investment impairment loss 0   12,186,000 0        
Impairment loss of investments measured at measurement alternatives       16,500,000        
Contract asset 0   0          
Contract liabilities 119,715,000   195,369,000     ¥ 195,369,000 ¥ 211,964,000 ¥ 33,884,000
Contract cost 0   0 0        
Advertising expense 124,658,000   82,921,000 82,340,000        
Employee benefit expenses 101,858,000   101,204,000 93,142,000        
Unrecognized tax benefits, income tax penalties and interest expense 0   0 ¥ 0        
Accounts receivable ¥ 56,813,000   ¥ 150,621,000          
Number of operating segments | Segment 1 1 1 1        
Long-Lived Assets                
Summary Of Significant Accounting Policies [Line Items]                
Discount rate     19.00%          
Royalty saving rate     1.00%          
Goodwill                
Summary Of Significant Accounting Policies [Line Items]                
Discount rate     17.00%          
Terminal growth rate     3.00%          
NCC                
Summary Of Significant Accounting Policies [Line Items]                
Intangible assets impairment losses     ¥ 14,733,000          
NCC | Paipai                
Summary Of Significant Accounting Policies [Line Items]                
Intangible assets impairment losses ¥ 0   200,708,000 ¥ 0        
Brand Names                
Summary Of Significant Accounting Policies [Line Items]                
Intangible assets impairment losses     185,975,000          
Brand Names | Paipai                
Summary Of Significant Accounting Policies [Line Items]                
Intangible assets impairment losses ¥ 0   200,708,000 ¥ 0        
Technology/platform                
Summary Of Significant Accounting Policies [Line Items]                
Intangible assets impairment losses     ¥ 6,217,000          
Customer | Net Revenues | Customers                
Summary Of Significant Accounting Policies [Line Items]                
Number of customers | Customer 0 0 0 0        
Percentage of concentration risk 10.00% 10.00% 10.00% 10.00%        
ASU 2016-02                
Summary Of Significant Accounting Policies [Line Items]                
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true              
Change in Accounting Principle, Accounting Standards Update, Adoption Date Dec. 31, 2021              
Paipai Marketplace                
Summary Of Significant Accounting Policies [Line Items]                
Number of warranty period for pre-owned consumer       1 year        
Level 2                
Summary Of Significant Accounting Policies [Line Items]                
Loss on assets and liabilities level 2 measured at fair value ¥ (4,545,000)   ¥ (36,432,000) ¥ (11,627,000)        
Level 3                
Summary Of Significant Accounting Policies [Line Items]                
Loss on assets and liabilities measured at fair value ¥ 0   ¥ (2,109,443,000) ¥ (16,500,000)        
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)