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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

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