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Short-term loan (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Mar. 23, 2018
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Line of Credit Facility              
Amount drawn           ¥ 85,856 $ 13,000
Short-term loan repayment   ¥ 16,367 $ 2,508 ¥ 52,859   19,060  
Subsidiaries | Hong Kong              
Line of Credit Facility              
Term of loan facility 24 months            
Maximum borrowing capacity $ 13,000            
Short-term loan repayment     $ 2,376   $ 7,666   $ 2,958
Interest expense | ¥   ¥ 90   ¥ 3,110   ¥ 1,944  
Total effective interest rate (percentage)       6.37% 6.37%    
Subsidiaries | Hong Kong | 3-month LIBOR              
Line of Credit Facility              
Interest rate spread (as a percent) 4.36%