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Short-term borrowings (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 10, 2020 CNY (¥) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | ---
Short-term Debt [Line Items] |  |  |  |
Total short-term borrowings | $ | $ 0 |  |  | $ 0
Amount of drew down |  | ¥ 3,000 |  |
4.55% Industrial & Commercial Bank of China |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Principal Amount |  |  | ¥ 3,000 |
Interest rate per annum |  |  | 4.55% |

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