Schedule of License, Royal and Other Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total royalty and other revenue	$ 2,187	$ 2,736
Royalty Revenue [Member] | Bellco License Agreement [Member]
Disaggregation of Revenue [Line Items]
Total royalty and other revenue		14
Other Revenue [Member]
Disaggregation of Revenue [Line Items]
Total royalty and other revenue	10	10
Royalty and Other revenues [Member]
Disaggregation of Revenue [Line Items]
Total royalty and other revenue	$ 10	$ 24