CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Total revenues	$ 6	$ 6,778
Operating expenses:
Research and development	3,119	5,983
General and administrative	2,422	3,533
Total operating expenses	5,541	9,516
Loss from operations	(5,535)	(2,738)
Other income (expense):
Interest and other income	79	56
Interest and other expense	(489)	(578)
Loss before income taxes	(5,945)	(3,260)
Income tax benefit	8	0
Net loss and comprehensive loss	$ (5,937)	$ (3,260)
Net loss per share, basic and diluted (in dollars per share)	$ (0.25)	$ (0.31)
Weighted average shares used to compute basic and diluted net loss per share (in shares)	24,064,373	10,379,830
Revenue under collaborations
Revenues:
Total revenues	$ 6	$ 6,778