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Accounts receivable, net (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Accounts Receivable Net [Line Items]
Accounts receivable, gross				¥ 206,772		¥ 161,300
Less: allowance for doubtful receivables	¥ (7,356)	¥ (7,356)	¥ (58,791)	(8,344)		(7,356)
Accounts receivable, net				¥ 198,428	$ 28,860	¥ 153,944
Summary of allowance for doubtful accounts
Balance at the beginning of the year	(7,356)	(55,220)	(58,791)
(Additions) reversals charged to general and administrative expenses, net	(1,198)	(3,049)	3,571
Write-off during the year	210	50,913	0
Balance at the end of the year	¥ (8,344)	¥ (7,356)	¥ (55,220)

X

- Definition

Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

+ References

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-Subparagraph (a)
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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

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Additions To Allowance For Doubtful Accounts.

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