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Accounts receivable, net - Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Accounts receivable, net      
Notes receivable   ¥ 5,235 ¥ 12,209
Accounts receivable, gross:   84,189 74,357
Less: allowance for doubtful accounts   (23,298) (14,175)
Accounts receivable, net $ 10,134 ¥ 66,126 ¥ 72,391