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Convertible Notes - Additional Information (Details) - Convertible notes (Notes) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 03, 2015 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares | Feb. 03, 2015 CNY (¥)
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 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 | $ / shares | $ 23.03 | $ 23.03 | $ 23.03 | $ 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 | $ 1,000 | $ 21,090 |  |  |
Stock issued during period, shares, conversion of convertible securities | shares |  | 457,881 |  |  |
American Depositary Shares |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stock issued during period, shares, conversion of convertible securities | shares |  | 915,762 |  |  |

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