Basis of Presentation (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total Revenue	$ 3,272	$ 3,750	$ 10,039	$ 10,296
Product sales [Member]
Total Revenue	805	1,538	3,273	3,760
Royalties [Member]
Total Revenue	$ 2,467	$ 2,212	$ 6,766	$ 6,536