CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating expenses:
Research and development	$ 4,231	$ 6,404
General and administrative	2,113	3,804
Total operating expenses	6,344	10,208
Loss from operations	(6,344)	(10,208)
Interest income	77	50
Interest expense	(6)
Interest expense - related party		(121)
Australian research and development incentives	646	397
Foreign currency gains (loss)	(144)	468
Loss on change in fair value of warrant liability	(4,851)
Net loss	(10,622)	(9,414)
Accretion of preferred stock to redemption value		(244)
Net loss attributable to common stockholders	$ (10,622)	$ (9,658)
Net loss per share - basic and diluted (in dollars per share)	$ (0.85)	$ (1.39)
Weighted average common shares outstanding - basic and diluted (in shares)	12,449,421	6,945,623