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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating expenses:
Research and development	$ 5,655	$ 4,744
General and administrative	4,783	1,366
Total operating expenses	10,438	6,110
Loss from operations	(10,438)	(6,110)
Other income (expense):
Interest income	69	69
Interest expense	(399)	(169)
Change in fair value of preferred stock warrant liability	(288)	(592)
Change in fair value of derivative liability	183	(565)
Total other income (expense), net	(435)	(1,257)
Net loss	(10,873)	(7,367)
Accruing dividends on Series A convertible preferred stock	(592)	(740)
Net loss attributable to common stockholders	$ (11,465)	$ (8,107)
Net loss per share attributable to common stockholders-basic and diluted	$ (6.67)	$ (17.70)
Weighted average common shares outstanding-basic and diluted	1,717,808	457,971

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