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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 |  |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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