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Income taxes - Additional Information (Details) - 6 months ended Jun. 30, 2022
¥ in Thousands, $ in Thousands
CNY (¥)
USD ($)
Disclosure Of Income Taxes [Line Items]    
Income tax expense ¥ 737 $ 110
Unrecognized uncertain tax positions 0  
Connect Biopharm LLC    
Disclosure Of Income Taxes [Line Items]    
Income tax expense ¥ 700 $ 100