Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating expenses:
Research and development	$ 4,825	$ 2,413
General and administrative	1,250	347
Total operating expenses	6,075	2,760
Loss from operations	(6,075)	(2,760)
Interest income	394
Interest expense		(599)
Change in fair value of derivative liability		(18)
Net loss	(5,681)	(3,377)
Other comprehensive loss:
Unrealized gain on available for sales securities	26
Total comprehensive loss	$ (5,655)	$ (3,377)
Net loss per share - basic and diluted	$ (1.61)	$ (1.01)
Weighted average shares of common stock outstanding - basic and diluted	3,521,045	3,359,989