CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating expenses:
Research and development	$ 1,804	$ 2,184
General and administrative	3,880	2,287
Total operating expenses and operating loss	(5,684)	(4,471)
Non-operating income (expense):
Change in fair value of warrant liability	1,881	0
Change in fair value of the contingent consideration	(3,411)	0
Loss on settlement of liability-classified warrants	(685)	0
Interest expense, net	(96)	(130)
Total non-operating income (expense), net	(2,311)	(130)
Net loss	(7,995)	(4,601)
Deemed dividend arising from beneficial conversion feature of convertible preferred stock	(1,968)	0
Net loss attributable to common stockholders	$ (9,963)	$ (4,601)
Per share information:
Net loss per common share attributable to common stockholders, basic and diluted (in dollars per share)	$ (1.67)	$ (3.63)
Weighted-average common shares outstanding, basic and diluted (in shares)	5,952,193	1,268,489