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Significant Accounting Policies - Additional information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 CNY (¥) Number shares | Dec. 31, 2021 CNY (¥) $ / shares | Dec. 31, 2020 CNY (¥) Number shares | Dec. 31, 2020 CNY (¥) $ / shares | Dec. 31, 2019 CNY (¥) | Dec. 31, 2021 USD ($) | Jan. 01, 2020 CNY (¥)
Disclosure of Accounting Policies [Line Items] |  |  |  |  |  |  |
Exchange rate | 6.3726 | 6.3726 |  |  |  | 6.3726 |
Restricted cash | ¥ 4,155 | ¥ 4,155 | ¥ 3,695 | ¥ 3,695 |  | $ 652 |
Number of lien arrangements | Number | 0 |  | 0 |  |  |  |
Weighted average contract period | 117 days |  | 124 days |  | 97 days |  |
Recognized revenue | ¥ 11,000 |  | ¥ 9,900 |  | ¥ 8,900 |  |
Revenue remaining performance obligation | 0 | 0 | 0 | 0 | 0 |  |
Contract assets | 0 | 0 | 0 | 0 | 0 |  |
Advertising and promotional expenses | 360,200 |  | 127,400 |  | 191,100 |  |
Employee benefit expenses | ¥ 57,200 |  | 38,500 |  | 36,000 |  |
Income tax examination likelihood of settlement | The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. |  |  |  |  |  |
Unrecognized uncertain tax positions | ¥ 0 | ¥ 0 | 0 | 0 | 0 |  |
Annual appropriation to reserve percent | 10.00% | 10.00% |  |  |  | 10.00% |
Threshold limit for reserve appropriation | 50.00% | 50.00% |  |  |  | 50.00% |
Appropriation to statutory reserves | ¥ 0 |  | 0 |  | 0 |  |
Cash and cash equivalents | 533,293 | ¥ 533,293 | 315,459 | 315,459 |  | $ 83,700 |
Lease liabilities | 31,005 | 31,005 | 4,296 | 4,296 |  |  | ¥ 11,700
Finance lease | 0 | 0 | 0 | 0 |  |  |
Operating lease liabilities, current | 13,929 | 13,929 | 3,709 | 3,709 |  | 2,186 | 8,300
Operating lease liabilities, non-current | 17,076 | 17,076 | 587 | 587 |  | $ 2,680 | ¥ 3,400
Investment income from its short term investments | ¥ 500 | ¥ 500 | ¥ 1,200 | ¥ 1,200 | ¥ 0 |  |
Finance Lease, Liability, Statement of Financial Position [Extensible List] | Finance lease | Finance lease | Finance lease | Finance lease |  | Finance lease |
Share option granted | shares | 0 |  | 0 |  |  |  |
Exercise price of fair value grant date price | $ / shares |  | ¥ 0 |  | ¥ 0 |  |  |
Alipay and WeChat Pay [Member] |  |  |  |  |  |  |
Disclosure of Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 11,300 | ¥ 11,300 | ¥ 11,600 | ¥ 11,600 |  |  |
Subsidiaries [Member] |  |  |  |  |  |  |
Disclosure of Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 237,800 | ¥ 237,800 | ¥ 152,000 | ¥ 152,000 |  |  |
Cash And Cash Equivalents Total [Member] | Subsidiaries [Member] |  |  |  |  |  |  |
Disclosure of Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  | 48.20% | 48.20% |  |  |
Cash And Cash Equivalents Total [Member] | VIE [Member] |  |  |  |  |  |  |
Disclosure of Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk percentage | 44.60% | 44.60% |  |  |  | 44.60% |
Bank Balance [Member] |  |  |  |  |  |  |
Disclosure of Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash | ¥ 4,200 | ¥ 4,200 |  |  |  |  |
Credit Card [Member] |  |  |  |  |  |  |
Disclosure of Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash | 1,200 | 1,200 |  |  |  |  |
Local Authorities [Member] |  |  |  |  |  |  |
Disclosure of Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash | ¥ 3,000 | ¥ 3,000 |  |  |  |  |

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