2. Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Disaggregation of revenue

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Paid-up Revenue Agreements	$	4,864	$	3,183	$	4,864	$	63,246
Recurring Revenue Agreements		596		3,302		3,983		5,332
	$	5,460	$	6,485	$	8,847	$	68,578

Schedule of short-term investments

	Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
	(In thousands)
Security Type
June 30, 2019:
Trading securities - debt	$	90,061	$	425	$	(4	)	$	90,482
Trading securities - equity		10,977		99		(142	)		10,934
	$	101,038	$	524	$	(146	)	$	101,416
December 31, 2018:
Trading securities - debt	$	33,643	$	18	$	(19	)	$	33,642
Trading securities - equity		3,389		27		(404	)		3,012
	$	37,032	$	45	$	(423	)	$	36,654

Schedule of financial assets measured at fair value

	Level 1		Level 2		Level 3
	(In thousands)
Assets as of June 30, 2019:
Trading securities - debt	$	–	$	90,482	$	–
Trading securities - equity		10,934		–		–
Investment at fair value - warrants (Note 5)		–		4,459		–
Investment at fair value - common stock (Note 5)		4,611		–		–
Total recurring fair value measurements as of June 30, 2019	$	15,545	$	94,941	$	–
Assets as of December 31, 2018:
Trading securities - debt	$	–	$	33,642	$	–
Trading securities - equity		3,012		–		–
Investment at fair value - warrants (Note 5)		–		2,064		–
Investment at fair value - common stock (Note 5)		5,395		–		–
Total recurring fair value measurements as of December 31, 2018	$	8,407	$	35,706	$	–