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QUARTERLY FINANCIAL INFORMATION (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Table Text Block Supplement [Abstract]
License revenue	$ 38	$ 38	$ 38	$ 38	$ 38	$ 38	$ 38	$ 38
Total costs and expenses	54,188	34,366	44,383	40,615	31,073	31,623	28,463	27,704	$ 174,552	$ 118,864	$ 79,121
Net loss	$ (53,861)	$ (33,951)	$ (44,142)	$ (41,529)	$ (30,860)	$ (31,536)	$ (28,353)	$ (27,727)
Basic and diluted net loss per common share	$ (0.68)	$ (0.43)	$ (0.59)	$ (0.59)	$ (0.46)	$ (0.48)	$ (0.45)	$ (0.52)	$ (2.30)	$ (1.91)	$ (1.60)

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