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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

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Term of accounts receivable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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