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Share Repurchase - Additional Information (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2017 CNY (¥) shares | Apr. 30, 2017 USD ($) shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2019 shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2017 USD ($) shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchase of ordinary shares |  |  | ¥ 31,280 | $ 4,809 |  |  |
Treasury stock acquired, shares |  |  | 99,347 | 99,347 |  |  |
Treasury shares canceled | 1,246,073 | 1,246,073 |  |  |  |  |
Treasury shares canceled, value | ¥ 121,452 | $ 18,667 |  |  |  |  |
Ordinary shares, treasury stock |  |  | 140,479 |  | 0 | 140,479 | 140,479
Treasury stock, value |  |  | ¥ 40,267 |  |  | ¥ 40,267 | $ 6,190
American Depositary Shares |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Treasury stock acquired, shares |  |  | 198,694 | 198,694 |  |  |
Treasury shares canceled | 2,492,146 | 2,492,146 |  |  |  |  |
Ordinary shares, treasury stock |  |  | 280,958 |  |  |  | 280,958

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