Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2022

Basis of Presentation [Abstract]

Schedule of revenue disaggregated by revenue source

Revenue disaggregated by revenue source for the three and six months ended June 30, 2022 and 2021 consists of the following (in thousands); revenue excludes sales and usage-based taxes when or if it has been determined that we are acting as a pass-through agent: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Product sales	$	1,432	$	1,305	$	2,366	$	2,468
Royalties		1,387		2,483		3,205		4,299
Total revenue	$	2,819	$	3,788	$	5,571	$	6,767