SETTLEMENTS, COMMITMENTS AND CONTINGENCIES SETTLEMENTS, COMMITMENTS AND CONTINGENCIES - Defined Contribution Pension Plan (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Commitments and Contingencies Disclosure [Abstract] | ||
| Matching contributions and certain other benefits | $ 0.3 | $ 0.3 |
| Percentage of additional employer matching contribution | 50.00% | 50.00% |
| Percentage of annual contributions per employee | 4.00% | 4.00% |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of contributions made by the employer to defined benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. No definition available.
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| X | ||||||||||
- Definition Percentage employer matches of the employee's percentage contribution matched. No definition available.
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