Marketable Securities

12 Months Ended

Dec. 31, 2020

Marketable Securities

Marketable Securities

(5) Marketable Securities

The following is a  summary of marketable debt securities, classified as available-for-sale:

			Gross		Gross
	Amortized		Unrealized		Unrealized		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
December 31, 2019
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	18,509	$	13	$	—	$	18,522
Maturing after one year through three years		—		—		—		—
Total U.S. government and municipal obligations	$	18,509	$	13	$	—	$	18,522
Corporate debt securities
Maturing in one year or less	$	34,619	$	13	$	(3)	$	34,629
Maturing after one year through three years		—		—		—		—
Total corporate debt securities	$	34,619	$	13	$	(3)	$	34,629
Total marketable securities	$	53,128	$	26	$	(3)	$	53,151

The Company holds investment grade marketable securities, and none were considered to be other‑than‑temporarily impaired as of December 31, 2020. Marketable securities include $0.2 million in accrued interest at December 31, 2020 and December 31, 2019.