Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Revenues	$ 784	$ 1,611
Operating expenses:
Research and development	7,826	6,852
General and administrative	3,672	2,455
Operating expenses, total	11,498	9,307
Loss from operations	(10,714)	(7,696)
Other income, net:
Interest expense, net	(315)	(564)
Change in fair value of PIPE Warrant liability	2,648	8,815
Other income, net	2,333	8,251
Net income (loss)	$ (8,381)	$ 555
Basic net income (loss) per share
Net income (loss) per share	$ (0.52)	$ 0.04
Weighted average number of common shares outstanding	16,081	13,230
Diluted net income (loss) per share
Net income (loss) per share	$ (0.52)	$ (0.62)
Weighted average number of common shares and dilutive common share equivalents outstanding	16,081	13,283
Collaboration and Licensing Revenue
Revenues:
Revenues	$ 493	$ 1,454
Partnership Royalties
Revenues:
Revenues	$ 291	$ 157