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SHARE-BASED COMPENSATION - Plans and Grants (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
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Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2018 CNY (¥) ¥ / shares shares | Aug. 31, 2016 shares | Dec. 31, 2018 ¥ / shares shares | Jul. 31, 2014 shares
SHARE-BASED COMPENSATION |  |  |  |  |
Share options granted (in shares) |  |  |  | 500,000 |
Exercise price (in USD or CNY per share) | ¥ / shares |  |  |  | ¥ 5.0 |
The 2014 Plan |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |
Total number shares which may be issued |  |  |  |  | 29,240,000
The 2014 Plan | A Consultant granted 500,000 options |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |
Share options granted (in shares) | 500,000 | 500,000 |  |  |
Exercise price (in USD or CNY per share) | (per share) | $ 0.7792 | ¥ 5.0 |  |  |
Contractual term | 5 years | 5 years |  |  |
Fair value of options granted and vested | $ 2,429 | ¥ 16,073 |  |  |
The 2016 Plan |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |
Authorized shares, automatic increment trigger (as a percent) |  |  | 1.50% |  |
The 2016 Plan | Ordinary Shares |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |
Total number shares which may be issued |  |  | 56,707,560 |  |
Authorized shares, maximum automatic approval (as a percent) |  |  | 3.00% |  |

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- Definition Fair value of options granted and vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References No definition available. + Details
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- Definition Percentage of automatic increment of shares authorized for issuance under share-based payment arrangement, calculated on the then total issued and outstanding shares of the Company. + References No definition available. + Details
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- Definition Percentage calculated on the then total issued and outstanding shares of the Company that shall trigger the automatic increment of shares authorized for issuance under share-based payment arrangement, if and whenever the shares which may be subject to the Awards under the Plan accounts for less than the said percentage. + References No definition available. + Details
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- Definition Number of shares authorized for issuance 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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