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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, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
ACCOUNTS RECEIVABLE, NET
Accounts receivable				¥ 21,667		¥ 25,257
Less: Allowance for doubtful accounts		¥ (746)	¥ (746)	(3,535)		(746)
Accounts receivable, net				¥ 18,132	$ 2,637	¥ 24,511
Allowance for doubtful accounts:
Balance at beginning of year		(746)	0
Addition	[1]	(4,616)	(746)
Written off	[1]	1,827	0
Balance at end of year		¥ (3,535)	¥ (746)
[1] Full provision was provided to receivables due from different customers due to the remote collectability, and certain provision was written off after all collection efforts have been exhausted and the potential for recovery was remote.

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- 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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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
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- Definition

Amount of valuation and qualifying accounts and reserves.

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Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

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Amount of decrease in valuation and qualifying accounts and reserves.

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