Condensed Consolidated Statements Of Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Condensed Consolidated Statements Of Comprehensive Loss [Abstract]
Revenue
Cost of sales	(3)		(6)
Gross margin	(3)		(6)
Selling, general and administrative expenses	1,652	1,848	3,585	4,128
Total operating expenses	1,652	1,848	3,585	4,128
Other income	28	194	56	194
Interest expense	(72)	(78)	(134)	(115)
Change in fair value of contingent payment obligations	(2,699)	(2,674)	(397)	(2,824)
Total interest and other	(2,743)	(2,558)	(475)	(2,745)
Net loss	(4,398)	(4,406)	(4,066)	(6,873)
Other comprehensive income, net of tax
Comprehensive loss	$ (4,398)	$ (4,406)	$ (4,066)	$ (6,873)
Earnings Per Share Basic And Diluted 1 [Abstract]
Basic	$ (0.06)	$ (0.06)	$ (0.05)	$ (0.10)
Diluted	$ (0.06)	$ (0.06)	$ (0.05)	$ (0.10)
Earnings Per Share Basic And Diluted Other Disclosures 1 [Abstract]
Basic	77,970	71,933	77,763	67,836
Diluted	77,970	71,933	77,763	67,836