INCOME TAXES - Tax Credits (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Tax credit carryforward | ||
| Orphan drug and research and development credits | $ 51,744 | $ 44,348 |
| Federal jurisdiction | Research | ||
| Tax credit carryforward | ||
| Amount of tax credit carryforward | 37,100 | |
| State jurisdiction | Research | ||
| Tax credit carryforward | ||
| Amount of tax credit carryforward | $ 26,900 |
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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