Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2020

Basis of Presentation [Abstract]

Schedule of revenue disaggregated by revenue source

Revenue disaggregated by revenue source for the three and nine months ended September 30, 2020 and 2019 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 September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Product sales	$	1,538	$	1,299	$	3,760	$	4,940
Royalties		2,212		2,390		6,536		6,346
Total revenue	$	3,750	$	3,689	$	10,296	$	11,286