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SHARE-BASED AWARDS (Narrative) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands								12 Months Ended
	Oct. 02, 2018 shares	Sep. 13, 2017 shares	Aug. 08, 2017 shares	Aug. 07, 2017 shares	Aug. 01, 2014 shares	Jul. 01, 2014 shares	Feb. 18, 2014 $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares	Dec. 31, 2019 CNY (¥) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary shares that may be issued								13,218,000			13,218,000
Options granted							3,479,604
Options granted, exercise price | $ / shares							$ 2.04
Unrecognized share-based compensation cost | ¥											¥ 0
Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation cost								$ 6,834			¥ 47,576
Shares granted	5,992,605	45,000	3,319,200	1,453,950	69,564,000	21,132,000	1,370,250,000		0	0
Shares vesting description								The Restricted Shares have a service condition where the grantees can remove restriction on 25% of total number of Restricted Shares on annual basis over a four-year period ending the fourth anniversary of the grant date.
Weighted-average vesting period over which deferred cost is expected to be recognized								2 years 3 months 18 days

X

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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