CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
License revenue	$ 375		$ 1,125
Operating expenses:
Research and development	5,369	$ 5,772	15,322	$ 18,698
General and administrative	2,514	2,151	7,188	6,481
Total operating expenses	7,883	7,923	22,510	25,179
Loss from operations	(7,508)	(7,923)	(21,385)	(25,179)
Interest income	3	80	91	281
Interest expense	(17)	(5)	(42)	(21)
Australian research and development incentives	228	(7)	343	129
Foreign currency gains (loss)	237	(80)	189	(114)
Loss before income taxes	(7,057)	(7,935)	(20,804)	(24,904)
Net loss	(7,057)	(7,935)	(20,804)	(24,904)
Dividend attributable to down round feature of warrants			(303)	(359)
Dividend attributable to Series A & B convertible preferred stock			(372)
Series A & B convertible preferred stock - beneficial conversion feature			(9,399)
Net loss attributable to common stockholders	$ (7,057)	$ (7,935)	$ (30,878)	$ (25,263)
Net loss per share
Basic (in dollars per share)	$ (0.09)	$ (0.33)	$ (0.58)	$ (1.15)
Diluted (in dollars per share)	$ (0.09)	$ (0.33)	$ (0.58)	$ (1.15)
Weighted average common shares outstanding
Basic (in shares)	76,321,644	23,923,196	53,548,902	22,039,386
Diluted (in shares)	76,321,644	23,923,196	53,548,902	22,039,386