Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total Revenue	$ 2,819	$ 3,788	$ 5,571	$ 6,767
Product sales [Member]
Total Revenue	1,432	1,305	2,366	2,468
Royalties [Member]
Total Revenue	$ 1,387	$ 2,483	$ 3,205	$ 4,299