Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating expenses:
Research and development	$ 1,026	$ 3,211	$ 2,424	$ 6,595
General and administrative	1,786	3,715	5,220	7,000
Total operating expenses	2,812	6,926	7,644	13,595
Operating loss	(2,812)	(6,926)	(7,644)	(13,595)
Other income (expense):
Interest income / (expense), net	33	32	51	69
Other income / (expense), net	26		68
Derivatives gain (loss)	(10,186)	554	(10,198)	795
Other income (expense), net	(10,127)	586	(10,079)	864
Net loss	$ (12,939)	$ (6,340)	$ (17,723)	$ (12,731)
Net loss per share, basic and diluted (in dollars per share)	$ (7.48)	$ (4.92)	$ (11.20)	$ (9.91)
Weighted average number of common shares outstanding, basic and diluted	1,729,248	1,287,424	1,581,924	1,284,610
Other comprehensive loss:
Net loss	$ (12,939)	$ (6,340)	$ (17,723)	$ (12,731)
Other comprehensive loss:
Unrealized gain (loss) on marketable securities		1		(1)
Comprehensive loss	$ (12,939)	$ (6,339)	(17,723)	$ (12,732)
Revenues			$ 0