Marketable Debt Securities (Tables)

6 Months Ended

Jun. 30, 2023

Marketable Debt Securities [Abstract]

Schedule of marketable debt securities

	June 30, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses(a)			Estimated Fair Value
Corporate bonds - presented in marketable debt securities	$	46,718	$	-	$	(336	)	$	46,382
Total	$	46,718	$	-	$	(336	)	$	46,382

(a) The unrealized loss of $336 is comprised of bonds with losses sustained for greater than 12 months of $211 and of bonds with losses sustained for less than 12 months of $125.

	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

	For the Three Months Ended June 30,					For the Six Months Ended June 30,
	2023		2022			2023		2022
Interest income	$	710	$	512		$	1,315	$	1,041
Dividend income		4		-			4		-
Accretion of discount (amortization of premium), net		132		(346	)		214		(756	)
Total interest and investment income	$	846	$	166		$	1,533	$	285