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INCOME TAXES - Deferred Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred tax assets |  |  |
Net operating loss carryforwards | $ 257,000 | $ 417,000 |
Deferred revenues | 0 | 1,000 |
Research and development tax credit carryforwards | 57,000 | 53,000 |
Other | 3,000 | 13,000 |
Total deferred tax assets before valuation allowance | 317,000 | 484,000 |
Valuation allowance | (303,000) | (484,000) |
Total deferred tax assets | 14,000 | 0 |
Deferred tax liabilities |  |  |
Debt issuance discount and other | (14,000) | 0 |
Net deferred tax assets | 0 | 0 |
Changes in valuation allowance |  |  |
Increase (decrease) in valuation allowance | $ (181,200) | 20,600 | $ 4,700
Early adoption | ASU 2016-09 |  |  |
Changes in valuation allowance |  |  |
Excess stock option tax benefits |  | $ 46,900 |

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