INVESTMENT SECURITIES, AVAILABLE-FOR-SALE AND FAIR VALUE MEASUREMENTS

12 Months Ended

Dec. 31, 2023

Investments, All Other Investments [Abstract]

INVESTMENT SECURITIES, AVAILABLE-FOR-SALE AND FAIR VALUE MEASUREMENTS

5. INVESTMENT SECURITIES, AVAILABLE-FOR-SALE AND FAIR VALUE MEASUREMENTS

Our investment securities, available-for-sale are comprised of corporate debt securities. The principal markets for the debt securities are dealer markets which have a high level of price transparency. The market participants for debt securities are typically large money center banks and regional banks, brokers, dealers, pension funds, and other entities with debt investment portfolios.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, the authoritative guidance establishes a three level fair value inputs hierarchy and requires an entity to maximize the use of observable valuation inputs and minimize the use of unobservable inputs. We use market data, assumptions and risks we believe market participants would use in measuring the fair value of the asset or liability, including the risks inherent in the inputs and the valuation techniques. The hierarchy is summarized below.

Level 1 – Quoted prices in active markets for identical assets and liabilities at the measurement date that the reporting entity has the ability to access.

Level 2 – Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3 – Unobservable inputs for which there is little or no market data, which requires us to develop our own assumptions, which are significant to the measurement of the fair values.

The valuation inputs hierarchy classification for assets measured at fair value on a recurring basis are summarized below as of December 31, 2023 and 2022 (in thousands). These tables do not include cash held in our money market savings accounts.

	Level 1		Level 2		Level 3		Total
As of December 31, 2023
Assets
Corporate debt securities	$	-	$	8,471	$	-	$	8,471
U.S. Treasury securities		-		20,140		-		20,140
	$	-	$	28,611	$	-	$	28,611

	Level 1		Level 2		Level 3		Total
As of December 31, 2022
Assets
Corporate debt securities	$	-	$	15,500	$	-	$	15,500
U.S. Treasury securities		-		46,673		-		46,673
	$	-	$	62,173	$	-	$	62,173

Our short-term investments are summarized below as of December 31, 2023 and 2022 (in thousands).

								Investment
	Cost/		Gross		Gross			Securities,
	Amortized		Unrealized		Unrealized			Available-
	Cost		Gains		Losses			For-Sale
As of December 31, 2023
Assets
Corporate debt securities	$	8,466	$	6	$	(1	)	$	8,471
U.S. Treasury securities		20,119		21		-			20,140
	$	28,585	$	27	$	(1	)	$	28,611

As of December 31, 2022
Assets
Corporate debt securities	$	15,538	$	-	$	(38	)	$	15,500
U.S. Treasury securities		46,762		2		(91	)		46,673
	$	62,300	$	2	$	(129	)	$	62,173

The maturities of the investment securities available-for-sale as of December 31, 2023 and 2022 are shown below (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
	Cost		Gains		Losses			Fair Value
As of December 31, 2023
Maturity date
Less than one year	$	28,585	$	27	$	(1	)	$	28,611
As of December 31, 2022
Less than one year	$	62,300	$	2	$	(129	)	$	62,173

The following table summarizes investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for more than 12 months as of December 31, 2023 and 2022 (in thousands):

	Less than Twelve Months					Twelve Months or Greater				Total
			Gross					Gross				Gross
	Fair		Unrealized			Fair		Unrealized		Fair		Unrealized
	Value		Losses			Value		Losses		Value		Losses
As of December 31, 2023
Corporate debt securities	$	1,488	$	(1	)	$	-	$	-		1,488		(1	)
U.S. Treasury securities		1,486		-			-		-		1,486		-
	$	2,974	$	(1	)	$	-	$	-	$	2,974	$	(1	)
As of December 31, 2022
Corporate debt securities	$	12,295	$	(38	)	$	-	$	-		12,295		(38	)
U.S. Treasury securities		34,530		(91	)		-		-		34,530		(91	)
	$	46,825	$	(129	)	$	-	$	-	$	46,825	$	(129	)