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Risks and concentration - Concentration of credit risk (Details)
¥ in Thousands, $ in Thousands, $ in Thousands
Dec. 31, 2019
HKD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Risks and Concentration        
Cash and cash equivalents   $ 49,262 ¥ 342,951 ¥ 413,143
Time deposits   20,698 144,093 162,688
Short-term investments   $ 65,060 452,936 136,304
Cash and cash equivalents | Geographic concentration risk | Hong Kong        
Risks and Concentration        
Cash and cash equivalents     51,077 149,503
Cash, insured amount | $ $ 500,000      
Cash and cash equivalents | Geographic concentration risk | People's Republic of China        
Risks and Concentration        
Cash and cash equivalents     205,854 196,352
Cash, insured amount     500,000  
Time deposits | Geographic concentration risk | People's Republic of China        
Risks and Concentration        
Time deposits     ¥ 213,509 ¥ 117,688