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v3.20.1

Fair Value Measurement - Short-term investments (Details) ¥ in Thousands, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 26, 2019 CNY (¥) | Apr. 28, 2018 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2019 CNY (¥) | Jul. 31, 2017 CNY (¥)
Fair Value Measurement |  |  |  |  |  |  |
Short-term wealth management product |  |  | $ 1,652 |  | ¥ 71,483 | ¥ 11,500 |
Repayments of debt |  |  | $ 63,925 | ¥ 445,030 | ¥ 683,100 |  |
Bank of China in Shenzhen |  |  |  |  |  |  |
Fair Value Measurement |  |  |  |  |  |  |
Face amount of the debt |  |  |  |  |  |  | ¥ 49,000
Repayments of debt | ¥ 49,000 |  |  |  |  |  |
Bank of China in Shenzhen | Collateral Pledged |  |  |  |  |  |  |
Fair Value Measurement |  |  |  |  |  |  |
Maturity term of short term investments |  | 363 days |  |  |  |  |
Short-term wealth management product |  | ¥ 49,883 |  |  |  |  |
Minimum |  |  |  |  |  |  |
Fair Value Measurement |  |  |  |  |  |  |
Maturity term of short term investments |  |  |  |  | 7 days |  |
Maximum |  |  |  |  |  |  |
Fair Value Measurement |  |  |  |  |  |  |
Maturity term of short term investments |  |  | 1 month | 1 month |  |  |

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