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v3.21.1

Significant Accounting Policies - Additional information (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2020 USD ($) $ / ¥ | Dec. 31, 2020 CNY (¥) $ / ¥ | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2017 CNY (¥)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Exchange rate (US$1.00) | $ / ¥ |  |  |  | 6.5250 | 6.5250 |  |  |
Cash at bank and demand deposits |  |  |  | $ 8,200 | ¥ 53,200 | $ 15,600 | ¥ 109,100 |
Cash and cash equivalents |  |  | ¥ 578,558 | 16,845 | 109,916 | $ 29,720 | 193,920 | ¥ 66,695
Time deposits |  |  |  | 7,000 | 45,674 |  | 69,762 |
Restricted cash |  |  |  | 4,571 | 29,829 |  | 1,529 |
Depreciation methods | straight-line method |  |  |  |  |  |  |
Impairment loss | ¥ 0 |  |  |  |  |  |  |
Goodwill |  |  |  | 17,688 | 115,414 |  |  |
Impairment charges | 0 |  |  |  |  |  |  |
Advertising and promotional expenses | 156,600 | ¥ 291,200 | 238,000 |  |  |  |  |
Employee benefits | ¥ 13,401 | ¥ 39,152 | 24,610 |  |  |  |  |
Total non-current assets |  |  |  | 48 | 313 |  | 7,577 |
operating lease ROU assets |  |  |  | 1,655 | 10,801 |  |  |
Operating lease liabilities |  |  |  | 1,526 | 9,959 |  |  |
Short-term operating lease liabilities (including short-term operating lease liabilities of the consolidated variable interest entities ("VIEs") without recourse to the primary beneficiary of nil and RMB1,025 as of December 31, 2019 and 2020, respectively) |  |  |  | 906 | 5,911 |  |  |
Long-term operating lease liabilities |  |  |  | $ 620 | 4,048 |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
operating lease ROU assets |  |  |  |  | 10,800 |  |  |
Operating lease liabilities |  |  |  |  | 9,900 |  |  |
Short-term operating lease liabilities (including short-term operating lease liabilities of the consolidated variable interest entities ("VIEs") without recourse to the primary beneficiary of nil and RMB1,025 as of December 31, 2019 and 2020, respectively) |  |  |  |  | 5,900 |  |  |
Long-term operating lease liabilities |  |  |  |  | 4,000 |  |  |
Other non-current assets |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Upfront issuance costs |  |  | 700 |  | 0 |  | 0 |
PRC subsidiaries, VIEs |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | ¥ 63,400 |  | ¥ 91,900 |
Percentage of cash and cash equivalents held y subsidiaries | 57.70% | 47.40% |  |  |  |  |  |
Employee benefits | ¥ 13,400 | ¥ 39,200 | ¥ 24,600 |  |  |  |  |

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