Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2018

Basis of Presentation [Abstract]

Schedule of revenue disaggregated by revenue source

Revenue disaggregated by revenue source for the three months ended March 31, 2018 and 2017, consists of the following (in thousands). Revenue excludes sales and usage-based taxes where it has been determined that we are acting as a pass-through agent.

	Three Months Ended March 31,
	2018		2017
Product sales	$	844	$	1,440
Royalties		2,166		1,644
Total revenue	$	3,010	$	3,084