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Summary of Significant Accounting Policies - Additional Information (Details) ¥ in Thousands, $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 CNY (¥) ¥ / Supplier | Jun. 30, 2021 USD ($) ¥ / Supplier | Jun. 30, 2020 CNY (¥) ¥ / Supplier | Jun. 30, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Foreign currency exchange rate | 6.4566 |  |  | 6.4566 |  |
Revenue Recognized | ¥ 44,405 | $ 6,877 | ¥ 25,368 |  |  |
Unsatisfied performance obligation | ¥ 31,425 |  |  | $ 4,867 |  |
Depreciation of the US$ against RMB, percent | 1.05% | 1.05% |  |  |  |
Advertising |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of suppliers | 3 | 3 | 3 |  |  |
Advertising | Supplier Concentration Risk | Cost of Goods and Service |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 49.20% | 49.20% | 76.10% |  |  |
CHINA |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents, restricted cash and short-term investments | ¥ 277,979 |  |  | 43,053 | ¥ 322,183 |
Outside China |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents, restricted cash and short-term investments | ¥ 21,136 |  |  | $ 3,274 |  | $ 17,494

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