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INCOME TAXES - Additional Tax Disclosures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes |  |  |  |
Accrued interest and penalties |  | $ 0 | $ 0 |
Federal corporate tax rate (as a percent) |  | 35.00% |  |
Net decrease related to federal deferred tax assets and deferred tax liabilities |  | $ 124,000 |  |
Change in valuation allowance |  | 124,000 |  |
Gross unrecognized tax benefits |  |  |  |
Unrecognized tax benefits, beginning of year | $ 15,488 | 15,488 | 15,488 | $ 15,459
Gross increase in tax portions |  | 0 | 0 | 29
Unrecognized tax benefits, end of year |  | 15,488 | $ 15,488 | $ 15,488
Forecast |  |  |  |
Income Taxes |  |  |  |
Federal corporate tax rate (as a percent) | 21.00% |  |  |
Federal |  |  |  |
Income Taxes |  |  |  |
Net operating loss carryforwards |  | 1,000,000 |  |
Federal | Research and development |  |  |  |
Income Taxes |  |  |  |
Tax credit carryforward amount |  | 45,200 |  |
State |  |  |  |
Income Taxes |  |  |  |
Net operating loss carryforwards |  | 654,200 |  |
State | Research and development |  |  |  |
Income Taxes |  |  |  |
Tax credit carryforward amount |  | $ 32,300 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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