Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating expenses:
Research and development	$ 18,317	$ 17,042
General and administrative	8,771	9,329
Total operating expenses	27,088	26,371
Loss from operations	(27,088)	(26,371)
Other income (expense):
Interest expense		(100)
Interest and investment income	845	425
Other (expense) income, net	(50)	176
Total other income, net	795	501
Net loss	$ (26,293)	$ (25,870)
Net loss per share - basic and diluted (in dollars per share)	$ (2.35)	$ (5.12)
Weighted-average common shares outstanding used in net loss per share - basic and diluted (in shares)	11,199,057	5,054,823