Marketable Debt Securities

12 Months Ended

Dec. 31, 2022

Marketable Debt Securities [Abstract]

Marketable Debt Securities

4. Marketable Debt Securities

Marketable debt securities, all of which were classified as available-for-sale, consist of the following:

	December 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Corporate bonds - presented in marketable debt securities		60,790		-		(547	)		60,243
Corporate bonds - presented in marketable debt securities, non-current		18,027		-		(141	)		17,886
Total	$	78,817	$	-	$	(688	)	$	78,129

	December 31, 2021
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Corporate bonds - presented in marketable debt securities	$	55,548	$	-	$	(43	)	$	55,505
Corporate bonds - presented in marketable debt securities, non-current		39,635		-		(168	)		39,467
Total	$	95,183	$	-	$	(211	)	$	94,972

The amount of realized gains and losses reclassified into earnings for the year ended December 31, 2022 was $17 included in investment income within the consolidated statements of operations and comprehensive loss. There were no sales of securities in the periods presented.

The contractual maturities of all securities held at December 31, 2022 was 16 months or less. Of the 34 securities in a loss position held by the Company, there were 16 securities in a continuous unrealized loss position for greater than twelve months at December 31, 2022. The total unrealized loss related to these securities was $358 and was not material. The Company has the ability to hold such securities with an unrealized loss until its forecasted recovery. The Company determined that there was no material change in the credit risk of the above investments. No other than temporary impairment loss has been recorded on the securities as of December 31, 2022, as the Company believes that any decrease in fair value of these securities is temporary and the Company expects to recover at least up to the initial cost of the investment for these securities. 

Interest and Investment Income

Interest and investment income consists of the following:

	December 31,
	2022			2021
Interest income	$	2,230		$	1,974
Accretion/(amortization) of discount/premium, net		(1,137	)		(1,737	)
Realized gain/(loss)		17			-
Total interest and investment income	$	1,110		$	237