Concentration of Risk, Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2018

Concentration Of Risk Segment And Geographic Information [Abstract]

Revenue by Geographical Region

Revenue attributed to the following geographic regions was as follows (in thousands) based on the location of the licensees:

	Year Ended December 31,
	2018		2017
United States	$	3,935	$	1,654
Europe		1,014		50,936
Asia Pacific		350		100
Total	$	5,299	$	52,690