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Convertible Notes - Additional Information (Details) - Convertible notes (Notes) ¥ / shares in Units, $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 03, 2015 USD ($) | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2019 CNY (¥) ¥ / shares | Feb. 03, 2015 CNY (¥) | Feb. 03, 2015 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | ¥ 556,900,000 |  | $ 80,000
Debt instrument, interest rate |  |  |  |  |  | 3.50% | 3.50%
Debt instrument, maturity date | Feb. 03, 2020 |  |  |  |  |  |
Debt Instrument, frequency of periodic payment | semiannually |  |  |  |  |  |
Debt instrument, initial conversion price | (per share) |  | $ 23.03 | $ 23.03 | $ 23.03 | ¥ 160.33 |  | $ 23.03
Debt Instrument, initial conversion rate | 43.4216 |  |  |  |  |  |
Debt Instrument, repurchase price as a percentage of principal amount | 100.00% |  |  |  |  |  |
Debt issuance costs | ¥ |  |  |  |  |  | ¥ 0 |
Number of ADS that each ordinary share represents | 2 |  |  |  |  |  |
Portion of debt to be converted | $ | $ 10,000 |  |  |  |  |  |
Amount of convertible notes converted | $ |  | $ 21,090 | $ 53,910 | $ 5,000 |  |  |
Stock issued during period, shares, conversion of convertible securities | shares |  | 457,881 | 1,170,430 | 108,554 |  |  |
American Depositary Share |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, shares, conversion of convertible securities | shares |  | 915,762 | 2,340,860 | 217,108 |  |  |

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