Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2022

Investments, All Other Investments [Abstract]

Schedule of Cash and Held to Maturity Securities

The following table summarizes the Company’s cash and held to maturity securities’ amortized cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category reported as cash and cash equivalents, restricted cash and investments as of December 31, 2022, and 2021:

	December 31, 2022
	Valuation									Balance Sheet Classification
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Restricted Cash- current		Short-term Investments		Restricted Cash
Cash	$	3,258	$	-	$	-		$	3,258	$	3,258	$	-	$	-	$	-
Level 2
Money market funds		1,615		-		-			1,615		346		525		-		744
US treasury securities		14,833		2		(2	)		14,833		4,982		-		9,851		-
Corporate debt securities		9,993		-		(6	)		9,987		-		-		9,993		-
Subtotal		26,441		2		(8	)		26,435		5,328		525		19,844		744
Total assets measured at fair value	$	29,699	$	2	$	(8	)	$	29,693	$	8,586	$	525	$	19,844	$	744

	December 31, 2021
	Valuation								Balance Sheet Classification
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Cash and Cash Equivalents		Restricted Cash- current		Short-term Investments		Restricted Cash
Cash	$	38,739	$	-	$	-	$	38,739	$	38,739	$	-	$	-	$	-
Level 2
Money market funds		1,405		-		-		1,405		-		453		-		952
Subtotal		1,405		-		-		1,405		-		453		-		952
Total assets measured at fair value	$	40,144	$	-	$	-	$	40,144	$	38,739	$	453	$	-	$	952