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SHARE-BASED COMPENSATION - Summary of Stock options activity (Details) - Stock options shares in Thousands	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Number of units
Granted | shares	59
Outstanding at the end | shares	59
Weighted Average Exercise Price
Granted (in dollars per share)	$ 13.63
Outstanding at the end	13.63
Weighted Average Fair Value
Granted (in dollars per share)	7.69
Outstanding at the end	$ 7.69
Granted (in years)	9 years 4 months 10 days
Outstanding at the end (in years)	9 years 4 months 10 days

X

- Definition

Weighted average remaining contractual term for option awards granted in period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Gross number of share options (or share units) granted during the period.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Number of options outstanding, including both vested and non-vested options.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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