Investments in Available-for-Sale Securities (Tables)

3 Months Ended

Mar. 31, 2021

Investments in Available-for-Sale Securities

Available-for-sale Securities

	March 31, 2021
			Gross					Allowance
			Unrealized					for Credit	Fair
	Cost Basis		Gains		Losses			Losses	Value
	(In thousands)
Available-for-sale:
U.S. government and agency securities	$	38,212	$	17	$	(67)	$	—	$	38,162
Corporate notes and bonds		29,521		—		(200)		—		29,321
Total Investments	$	67,733	$	17	$	(267)	$	—	$	67,483

	December 31, 2020
			Gross					Allowance
			Unrealized					for Credit	Fair
	Cost Basis		Gains			Losses		Losses	Value
	(In thousands)
Available-for-sale:
U.S. government and agency securities	$	57,299	$	11	$	(86)	$	—	$	57,224
Corporate notes and bonds		39,817		1		(277)		—		39,541
Total Investments	$	97,116	$	12	$	(363)	$	—	$	96,765