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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) |  |  |  |

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