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ORDINARY SHARE AND SHARE INCENTIVE PLANS - Stock Incentive Plans - Additional Information (Details) - shares |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 04, 2016 | Jul. 21, 2006 | Dec. 31, 2019 | Dec. 31, 2016
2017 Equity Incentive Plan |  |  |  |
Stock Incentive Plans |  |  |  |
Number of shares authorized |  |  |  | 2,000,000
Vesting period |  |  | 4 years |
Number of ordinary shares available for issuance pursuant to future grants |  |  | 2,003,580 |
Number of shares transferred from the prior plan |  |  | 1,590,693 | 960,940
2017 Equity Incentive Plan | Stock Options and Restricted Stock Units RSU |  |  |  |
Stock Incentive Plans |  |  |  |
Number of awards outstanding (in shares) |  |  | 1,334,657 |
2006 Equity Incentive Plan |  |  |  |
Stock Incentive Plans |  |  |  |
Number of shares authorized |  | 1,500,000 |  |
Number of awards outstanding (in shares) |  |  |  | 2,042,798
Number of shares expired |  |  | 1,590,693 |
Vesting period |  | 4 years |  |
Number of shares transferred from the prior plan |  |  |  | 8,474,347
Number of additional shares authorized | 1,500,000 |  |  |
2006 Equity Incentive Plan | Employee and Directors Stock Options |  |  |  |
Stock Incentive Plans |  |  |  |
Expiration term |  |  |  | 7 years
2006 Equity Incentive Plan | Employee and Directors Stock Options | Minimum |  |  |  |
Stock Incentive Plans |  |  |  |
Exercise price as a percentage of the fair market value of an ordinary share on the date of grant |  |  |  | 100.00%
2006 Equity Incentive Plan | Employee and Directors Stock Options | Maximum |  |  |  |
Stock Incentive Plans |  |  |  |
Percentage of voting power required of the company's stock for specified exercise price |  |  |  | 110.00%
2006 Equity Incentive Plan | Incentive Stock Option |  |  |  |
Stock Incentive Plans |  |  |  |
Percentage of voting power required of the company's stock for specified vesting period |  |  |  | 10.00%
Expiration term |  |  |  | 5 years

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- 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 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 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. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under share-based payment arrangement. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Represents the exercise price as a percentage of the fair market value of a single share of common stock on the date of grant. + References No definition available. + Details
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- Definition Represents the number of shares originally approved (usually by shareholders and board of directors) for awards under the prior plan of equity based compensation transferred to the current plan. + References No definition available. + Details
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- Definition Represents the percentage of voting power in the entity's common stock required for a specified exercise price to be effective. + References No definition available. + Details
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- Definition Represents the percentage of voting power in the entity's common stock required for a specified vesting period to be effective. + References No definition available. + Details
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