Marketable Securities

9 Months Ended

Sep. 30, 2022

Marketable securities

Marketable securities

4. Marketable Securities

As of September 30, 2022 and December 31, 2021, the fair value of available-for-sale marketable debt securities by type of security was as follows:

		September 30, 2022
				Gross		Gross
		Amortized		Unrealized		Unrealized		Fair
(in thousands)		Cost		Gain		Loss		Value
Assets
Marketable securities:
U.S. Treasury notes	$	94,657	$	—	$	(742)	$	93,915
	$	94,657	$	—	$	(742)	$	93,915

		December 31, 2021
				Gross		Gross
		Amortized		Unrealized		Unrealized		Fair
(in thousands)		Cost		Gain		Loss		Value
Assets
Marketable securities:
U.S. Treasury notes	$	110,747	$	—	$	(202)	$	110,545
	$	110,747	$	—	$	(202)	$	110,545

At September 30, 2022 and December 31, 2021, all available-for-sale marketable securities had contractual maturities of less than two years.