Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating expenses:
Research and development expenses				$ 11,100
General and administrative expenses	$ 1,007	$ 4,346	$ 4,126	13,958
Gain on sale of assets		(3,500)	(2,139)	(4,910)
Total operating expenses	1,007	846	1,987	20,148
Loss from operations	(1,007)	(846)	(1,987)	(20,148)
Other income and expenses:
Interest income	1	140	49	712
Interest expense				(1,527)
Other income, net		1	18	370
Total other income and expenses	1	141	67	(445)
Net loss	(1,006)	(705)	(1,920)	(20,593)
Other comprehensive income:
Unrealized gain on marketable securities				9
Other comprehensive income				9
Comprehensive loss	$ (1,006)	$ (705)	$ (1,920)	$ (20,584)
Net loss per common share - basic and diluted	$ (0.08)	$ (0.05)	$ (0.14)	$ (1.54)
Weighted-average common shares used to compute basic and diluted net loss per common share	13,380	13,358	13,380	13,348
Cash dividend paid per common share		$ 1.4967		$ 1.4967