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Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Accounts Receivable, Net [Abstract]      
Accounts receivable, gross: ¥ 52,746   ¥ 8,885
Less: allowance for doubtful accounts (491)   (418)
Accounts receivable, net ¥ 52,255 $ 7,600 ¥ 8,467