Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2021

Marketable Securities

Schedule of marketable debt securities, classified as available-for-sale

	Gross Unrealized
	Amortized						Fair
	Cost		Gains		Losses		Value
	(In thousands)
June 30, 2021
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	16,168	$	3	$	—	$	16,171
Maturing after one year through three years		8,181		2		—		8,183
Total U.S. government and municipal obligations	$	24,349	$	5	$	—	$	24,354
Corporate debt securities
Maturing in one year or less	$	96,246	$	—	$	(9)	$	96,237
Maturing after one year through three years		—		—		—		—
Total corporate debt securities	$	96,246	$	—	$	(9)	$	96,237
Total marketable securities	$	120,595	$	5	$	(9)	$	120,591
	Gross Unrealized
	Amortized						Fair
	Cost		Gains		Losses		Value
	(In thousands)
December 31, 2020
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	40,328	$	3	$	(2)	$	40,329
Maturing after one year through three years		—		—		—		—
Total U.S. government and municipal obligations	$	40,328	$	3	$	(2)	$	40,329
Corporate debt securities
Maturing in one year or less	$	110,265	$	2	$	(10)	$	110,257
Maturing after one year through three years		—		—		—		—
Total corporate debt securities	$	110,265	$	2	$	(10)	$	110,257
Total marketable securities	$	150,593	$	5	$	(12)	$	150,586