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INCOME TAXES (Details 1) - USD ($)
$ in Thousands
12 Months Ended
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