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SHARE-BASED COMPENSATION - Employee Share options (Details) - Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SHARE-BASED COMPENSATION
Share options granted (in shares)	1,063,293	5,296,204	2,303,900
Share options granted (in dollars per share)	$ 4.12	$ 2.17	$ 1.84
Contractual term of options granted	10 years	10 years	10 years
Vesting period	4 years	4 years	4 years
Percentage of stock awards vesting each year	25.00%	25.00%	25.00%
One year after grant date
SHARE-BASED COMPENSATION
Vesting period	1 year	1 year	1 year
Vesting percentage (as a percent)	40.00%	40.00%	40.00%
Annual basis over 3 years
SHARE-BASED COMPENSATION
Vesting period	3 years	3 years	3 years
Vesting percentage (as a percent)	60.00%	60.00%	60.00%

X

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

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-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

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

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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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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.

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-SubTopic 10
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