Basis of Presentation (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total Revenue	$ 3,750	$ 3,689	$ 10,296	$ 11,286
Product sales [Member]
Total Revenue	1,538	1,299	3,760	4,940
Royalties [Member]
Total Revenue	$ 2,212	$ 2,390	$ 6,536	$ 6,346