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INCOME TAXES (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Loss before income taxes, as reported in the consolidated statements of operations | $ (173,482) | $ (118,476) | $ (78,253)
Computed "expected" tax benefit | (36,431) | (40,282) | (26,606)
Increase (decrease) in income taxes resulting from: |  |  |
Expected benefit from state and local taxes | (2,243) | (1,106) | (835)
Research and development credits | (4,726) | (3,697) | (2,364)
Other | 639 | 1,563 | (8)
Impact of change in state tax rates on deferred taxes | (473) | 8,213 | 0
Stock awards | 0 | 51,768 | 0
Effects of federal tax reform rate changes | 43,234 | (16,459) | 29,813
Change in the balance of the valuation allowance for deferred tax assets | 0 | 0 | 0
Income Tax Expense (Benefit) | $ 0 | $ 0 | $ 0

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