Condensed Consolidated Statements Of 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
Condensed Consolidated Statements Of Comprehensive Loss [Abstract]
Product revenue		$ 35		$ 70
Cost of sales		(35)		(70)
Gross margin
Research and development expenses				334
Selling, general and administrative expenses	1,445	1,950	$ 9,268	5,957
Total operating expenses	1,445	1,950	9,268	6,291
Interest and other income	1	3	1	3
Interest expense	(119)	(104)	(420)	(242)
Change in fair value of contingent payment obligations	(105)	(68)	(3,487)	755
Total interest and other	(223)	(169)	(3,906)	516
Net loss	(1,668)	(2,119)	(13,174)	(5,775)
Other comprehensive loss, net of tax
Comprehensive loss	$ (1,668)	$ (2,119)	$ (13,174)	$ (5,775)
Basic and diluted net loss per common share	$ (0.03)	$ (0.07)	$ (0.29)	$ (0.19)
Weighted average common shares outstanding	50,530	32,012	44,772	30,706