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Summary of Significant Accounting Policies - Additional Information (Details) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 01, 2017 shares | Dec. 31, 2021 CNY (¥) Segment Supplier shares | Dec. 31, 2021 USD ($) Segment Supplier shares | Dec. 31, 2020 CNY (¥) Supplier shares | Dec. 31, 2019 CNY (¥) Supplier shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Nov. 20, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Foreign currency exchange rate |  | 6.3726 |  |  |  | 6.3726 |  |
Finite lived intangible asset residual value |  | ¥ 0 |  |  |  |  |  |
Revenue Recognized |  | 62,790,000 | $ 9,853,000 | ¥ 34,449,000 |  |  |  |
Unsatisfied performance obligation |  | 42,019,000 |  | 31,951,000 |  | $ 6,594,000 |  |
Impairment of long-term investments |  | 25,370,000 | 3,981,000 | 38,739,000 | ¥ 0 |  |  |
Non cash impairment loss on long term investments |  | 25,370,000 | 3,981,000 | 39,181,000 |  |  |  |
Non Cash Impairment Loss On Long Term Investments |  | 528,000 | $ 83,000 | 4,500,000 |  |  |  |
Impairment of long-lived assets other than goodwill |  | ¥ 0 |  | 10,952,000 | 0 |  |  |
Value added tax percentage |  | 6.00% | 6.00% |  |  |  |  |
Share repurchased cash consideration |  |  |  |  | 37,559,000 |  |  |
Research and development cost, capitalized |  | ¥ 0 |  |  |  |  |  |
Advertising expenses |  | ¥ 12,767,000 | $ 2,003,000 | 9,789,000 | 17,311,000 |  |  |
Profit sharing program, recognized period |  | 5 years | 5 years |  |  |  |  |
Capital leases |  | ¥ 0 |  |  |  |  |  |
Employee defined contribution plan expense incurred |  | ¥ 16,714,000 | $ 2,623,000 | 10,556,000 | 20,724,000 |  |  |
Depreciation of the US$ against RMB, percent |  | 2.34% | 2.34% |  |  |  |  |
Number of reportable segment | Segment |  | 1 | 1 |  |  |  |  |
Revenues |  | ¥ 357,322,000 | $ 56,072,000 | ¥ 471,614,000 | ¥ 906,458,000 |  |  |
Supplier Concentration Risk | Suppliers | Three Suppliers [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Concentration risk, percentage |  | 46.40% | 46.40% |  |  |  |  |
Product Concentration Risk | Suppliers | Three Suppliers [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  | 71.00% | 57.70% |  |  |
Advertising |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of suppliers | Supplier |  | 3 | 3 | 3 | 3 |  |  |
CHINA |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents, restricted cash and short-term investments |  | ¥ 276,644,000 |  | ¥ 322,183,000 |  | 43,412,000 |  |
Outside China |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents, restricted cash and short-term investments |  | ¥ 13,927,000 |  |  |  | $ 2,186,000 | $ 17,494,000 |
Maximum |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Revenues | $ |  |  | $ 1,070,000,000.00 |  |  |  |  |
Maximum | Product Concentration Risk | Suppliers |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Concentration risk, percentage |  | 50.00% | 50.00% |  |  |  |  |
American Depositary Shares |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share repurchased under repurchase plan | shares |  | 920,606 | 920,606 |  |  |  |  |
Share repurchased cash consideration | $ |  |  | $ 5,910,000 |  |  |  |  |
American Depositary Shares | Maximum |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share repurchase plan, authorized amount | $ |  |  |  |  |  |  |  | $ 10,000,000
Class A Common Shares |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share repurchased under repurchase plan | shares | 613,737 | 613,737 | 613,737 | 613,737 | 613,737 |  |  |

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