Investments (Tables)

6 Months Ended

Jun. 30, 2020

Investments

Schedule of available-for-sale investments at fair value

	June 30, 2020
			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
(In thousands)	Cost		(Losses)		Gains		Value
Short-term investments – commercial paper	$	3,196	$	—	$	—	$	3,196
Total short-term investments	$	3,196	$	—	$	—	$	3,196

	December 31, 2019
			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
(In thousands)	Cost		(Losses)		Gains		Value
Short-term investments – commercial paper	$	2,774	$	—	$	—	$	2,774
Total short-term investments	$	2,774	$	—	$	—	$	2,774