Condensed Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating expenses
Research and development	$ 2,760	$ 1,180
General and administrative	2,012	1,867
Change in fair value of contingent consideration	206	428
Total operating expenses	4,978	3,475
Operating loss	(4,978)	(3,475)
Other income (expense)
Cease-use income		3
Change in fair value of warrants liabilities	(1,919)	163
Loss from minority interest investment	(190)
Interest income	57	19
Total other income (expense)	(2,052)	185
Loss from continuing operations	(7,030)	(3,290)
Loss from discontinued operations		(514)
Net loss	$ (7,030)	$ (3,804)
Loss per common share from continuing operations, basic and diluted	$ (0.22)	$ (0.17)
Loss per common share from discontinued operations, basic and diluted		(0.02)
Net loss per common share, basic and diluted	$ (0.22)	$ (0.19)
Weighted-average common shares outstanding used to calculate basic and diluted net loss per common share	31,756,120	19,530,311