Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating expenses:
Research and development	$ 4,931	$ 11,083
General and administrative	7,836	13,510
Total operating expenses	12,767	24,593
Operating loss	(12,767)	(24,593)
Other income (expense):
Interest income / (expense), net	206	115
Other income	1,303
Derivatives (loss)	(12,165)	(2,267)
Other income / (expense), net	(10,656)	(2,152)
Net loss	$ (23,423)	$ (26,745)
Net loss per share, basic and diluted (in dollars per share)	$ (4.69)	$ (20.29)
Weighted average number of common shares outstanding, basic and diluted	4,990,089	1,318,003
Other comprehensive loss:
Net loss	$ (23,423)	$ (26,745)
Other comprehensive loss:
Comprehensive loss	$ (23,423)	$ (26,745)