SHARE-BASED COMPENSATION - Employee Equity Incentive Plan Narrative (Details)	12 Months Ended
Dec. 31, 2019
SHARE-BASED COMPENSATION
Trading days	20 days
Vesting period	4 years
Percentage of options vesting after one year	25.00%
Vesting period for specific portion of awards	1 year
Period after the first year during which award vests quarterly	3 years
Maximum term of awards granted under the plan	10 years
2007 Plan
SHARE-BASED COMPENSATION
Period following the consummation of a change of control within which the grantee ceases to be an eligible participant	3 months
2016 Plan
SHARE-BASED COMPENSATION
Maximum percentage of issued share capital authorized for issuance of share based awards	20.00%
Period following the consummation of a change of control within which the grantee ceases to be an eligible participant	9 months
2018 plan
SHARE-BASED COMPENSATION
Vesting period	4 years
Percentage of options vesting after one year	25.00%
Vesting period for specific portion of awards	1 year
Period after the first year during which award vests quarterly	3 years
Maximum term of awards granted under the plan	10 years

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.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Represents the period after the first year during which award vests quarterly.

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Represents the period following consummation of a change of control within which the grantee ceases to be an eligible participant.

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Represents the vesting period for a specific portion of awards.

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Represents the maximum term of awards from the date of grant.

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The number of threshold trading days should be considered for average share price.

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, shown as a percentage.

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