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Accounts Receivable, net - Summary (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Accounts receivable   ¥ 549,950 ¥ 184,339
Less: allowance for doubtful accounts   (11,413) (2,070)
Accounts receivable, net $ 77,356 ¥ 538,537 ¥ 182,269
Minimum      
Terms of accounts receivable 90 days    
Maximum      
Terms of accounts receivable 270 days