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Intangible assets, net (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense ¥ 5,631 ¥ 5,831 ¥ 4,076
Amortization expense of existing intangible assets, one year 4,662    
Amortization expense of existing intangible assets, two year 3,693    
Amortization expense of existing intangible assets, three year 3,693    
Amortization expense of existing intangible assets, four year 1,620    
Amortization expense of existing intangible assets, five year ¥ 1,620