Marketable Securities (Tables)

9 Months Ended

Sep. 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 September 30, 2022 and December 31, 2021 at net book value:

	September 30, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In thousands)
Marketable securities:
U.S. Treasury and other government securities	$	295,367	$	-	$	(3,840	)	$	291,527
Financial institution debt securities		327,417		-		(2,154	)		325,263
Corporate debt securities		67,018		-		(772	)		66,246
Other asset-backed securities		24,925		-		(428	)		24,497
Total	$	714,727	$	-	$	(7,194	)	$	707,533
	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