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Prepayments and other assets - Allowance for doubtful accounts (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Prepayment and other assets
Balance at the beginning of the year	¥ 1,113	¥ 1,411	¥ 1,324
Provision (Reversal) for the year	3,142	(493)	2,701
Write-off			(2,614)
Collection of previously written-off debtors		195
Balance at the end of the year	¥ 4,255	¥ 1,113	¥ 1,411

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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