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COMMON STOCK AND STOCK INCENTIVE PLANS - Stock Incentive Plans (Details) - shares |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 04, 2016 | Jul. 21, 2006 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 04, 2016
2017 Equity Incentive Plan |  |  |  |  |
Stock Incentive Plans |  |  |  |  |
Number of shares authorized |  |  |  | 2,000,000 |
Number of ordinary shares available for issuance pursuant to future grants |  |  | 3,469,239 | 2,960,940 | 960,940
Number of shares transferred from the prior plan |  |  |  | 960,940 |
Vesting period |  |  | 4 years |  |
2017 Equity Incentive Plan | Stock Options and Restricted Stock Units RSU |  |  |  |  |
Stock Incentive Plans |  |  |  |  |
Number of awards outstanding (in shares) |  |  | 1,165,623 |  |
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 |  |  |  | 1,546,927 |
Number of ordinary shares available for issuance pursuant to future grants |  |  |  | 1,022,114 |
Number of additional shares authorized | 1,500,000 |  |  |  |
Number of shares transferred from the prior plan |  |  |  | 8,474,347 |
Vesting period |  | 4 years |  |  |
2006 Equity Incentive Plan | Employee and Directors Stock Options |  |  |  |  |
Stock Incentive Plans |  |  |  |  |
Expiration term |  |  |  | 7 years |
2006 Equity Incentive Plan | Incentive Stock Option |  |  |  |  |
Stock Incentive Plans |  |  |  |  |
Expiration term |  |  |  | 5 years |
Percentage of voting power required of the company's stock for specified vesting period |  |  |  | 10.00% |
2006 Equity Incentive Plan | Minimum | Stock Options and Restricted Stock Units RSU |  |  |  |  |
Stock Incentive Plans |  |  |  |  |
Vesting period |  |  |  | 1 year |
2006 Equity Incentive Plan | Minimum | Employee and Directors Stock Options |  |  |  |  |
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 | Maximum | Stock Options and Restricted Stock Units RSU |  |  |  |  |
Stock Incentive Plans |  |  |  |  |
Vesting period |  |  |  | 4 years |
2006 Equity Incentive Plan | Maximum | Employee and Directors Stock Options |  |  |  |  |
Stock Incentive Plans |  |  |  |  |
Percentage of voting power required of the company's stock for specified exercise price |  |  |  | 110.00% |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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 an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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 The period of time from the grant date until the time at which the share-based award expires. + 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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