Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2022

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-sale Marketable Securities

The following table summarizes the Company’s available-for-sale marketable securities as of June 30, 2022 and December 31, 2021 at net book value:

	June 30, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In thousands)
Marketable securities:
U.S. Treasury and other government securities	$	295,742	$	-	$	(4,454	)	$	291,288
Financial institution debt securities		303,294		-		(2,296	)		300,998
Corporate debt securities		52,575		-		(724	)		51,851
Other asset-backed securities		115,671		-		(710	)		114,961
Total	$	767,282	$	-	$	(8,184	)	$	759,098
	December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In thousands)
Marketable securities:
U.S. Treasury and other government securities	$	301,493	$	-	$	(1,016	)	$	300,477
Financial institution debt securities		441,068		-		(652	)		440,416
Corporate debt securities		62,500		-		(151	)		62,349
Other asset-backed securities		159,707		-		(306	)		159,401
Total	$	964,768	$	-	$	(2,125	)	$	962,643