Marketable Securities

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

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


	December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Marketable debt securities:
U.S. Treasury notes	$	77,550	$	—	$	(188)	$	77,362
U.S. government agency bonds	20,775		—		(33)		$	20,742
	$	98,325	$	—	$	(221)	$	98,104

The amortized cost and fair value of the Company’s available-for-sale securities by contractual maturity are summarized as follows:


	December 31, 2021
	Amortized Cost		Fair Value
Maturing in one year or less	$	60,462	$	60,406
Maturing in more than one year	37,863		$	37,698
	$	98,325	$	98,104

As of December 31, 2020, there were no available-for-sale marketable debt securities.

The cost of securities sold is determined based on the specific identification method for purposes of recording realized gains and losses. During the year ended December 31, 2021, there were no realized losses on sales of marketable securities. During the years ended December 31, 2020 and 2019 realized gain on sales of marketable securities were $12 and $7, respectively. There were no marketable securities that required adjustment for other-than-temporary declines in fair value during the years ended December 31, 2021, 2020, and 2019.

There were 54 securities held by the Company in an unrealized loss position for less than twelve months as of December 31, 2021. The aggregate fair value of securities held by the Company in an unrealized loss position for less than twelve months as of December 31, 2021 was $98,104. There were no securities held by the Company in an unrealized loss position for less than twelve months as of December 31, 2020. There were no securities held in an unrealized loss position for more than twelve months as of December 31, 2021 and 2020. The Company determined that there was no material change in the credit risk of these investments. As a result, the Company determined it did not hold any investments with an other-than-temporary decline in fair value as of December 31, 2021 and 2020.