Prepayments and other current assets (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Prepayments and other current assets
Prepayments to suppliers	¥ 232,906	$ 35,694	¥ 475,828
Interest income receivable	278	43	14,876
Prepayment for advertising expenses	1,514	232	8,417
Receivables in relation to factoring business	0	0	204,954
Loan receivables	22,934	3,515	439,189
Value-added tax receivables	78,218	11,987	67,931
Receivables from employees	19,337	2,964	32,870
Others	23,517	3,603	56,219
Total	¥ 378,704	$ 58,038	¥ 1,300,284

Amount represents the receivables in relation to factoring business.

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Amount, after allowance for credit loss, of accounts and financing receivables, classified as current. Includes, but is not limited to, notes and loan receivable.

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Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Amount of current assets classified as other.

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Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Amount of consideration paid in advance for supplies that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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