Marketable Debt Securities (Tables)

9 Months Ended

Sep. 30, 2023

Marketable Debt Securities [Abstract]

Schedule of Marketable Debt Securities

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

	September 30, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses(a)			Estimated Fair Value
Corporate bonds - presented in marketable debt securities	$	40,431	$	-	$	(165	)	$	40,266
Total	$	40,431	$	-	$	(165	)	$	40,266

	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

Schedule of Interest and Investment Income

Investment income consists of the following:

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2023		2022			2023		2022
Interest income	$	710	$	557		$	2,025	$	1,598
Dividend income		2		-			6		-
Accretion of discount (amortization of premium), net		128		(274	)		342		(1,030	)
Total interest and investment income	$	840	$	283		$	2,373	$	568