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Long-term investments - Additional Information (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 | Jun. 30, 2017 CNY (¥) item
Equity And Cost Method Investments |  |  |  |  |  |  |
Share of gain (loss) from equity method investment |  | $ (340) | $ (265) | $ (548) | $ (671) |  |
JING |  |  |  |  |  |  |
Equity And Cost Method Investments |  |  |  |  |  |  |
Share of gain (loss) from equity method investment |  | 340 | $ 265 | 1,011 | $ 671 |  |
Equity method investment, gain on disposal |  | $ 0 |  | $ 463 |  |  |
Number of third-parties | item |  |  |  |  |  |  | 3
Capital contribution commitment | ¥ |  |  |  |  |  |  | ¥ 26,250
Percentage of equity interest |  | 18.00% |  | 18.00% |  | 20.00% |
MacroGenics |  |  |  |  |  |  |
Equity And Cost Method Investments |  |  |  |  |  |  |
Share of gain (loss) from equity method investment |  | $ 9,930 |  | $ 9,930 |  |  |
Capital contribution commitment | $ 30,000 |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | shares | 958,467 |  |  |  |  |  |
Issue price per share | $ / shares | $ 31.30 |  |  |  |  |  |

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