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

3 Months Ended

Mar. 31, 2022

Investments, All Other Investments [Abstract]

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

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

Our investment securities, available-for-sale are comprised of corporate and government 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 March 31, 2022 and December 31, 2021 (in thousands). These tables do not include cash held in our money market savings accounts.

As of March 31, 2022		Level 1		Level 2		Level 3		Total
Assets
Corporate debt securities	$	-	$	34,174	$	-	$	34,174
U.S. Treasury securities		-		13,477		-		13,477
	$	-	$	47,651	$	-	$	47,651

As of December 31, 2021		Level 1		Level 2		Level 3		Total
Assets
Corporate debt securities	$	-	$	32,720	$	-	$	32,720
	$	-	$	32,720	$	-	$	32,720

Our short-term investments are summarized below as of March 31, 2022 and December 31, 2021 (in thousands).

								Investment
		Cost/		Gross		Gross		Securities,
		Amortized		Unrealized		Unrealized		Available-
		Cost		Gains		Losses		For-Sale
As of March 31, 2022
Assets
Corporate debt securities	$	34,291	$	-	$	(117)	$	34,174
U.S. Treasury securities		13,484		1		(8)		13,477
	$	47,775	$	1	$	(125)	$	47,651

								Investment
		Cost/		Gross		Gross		Securities,
		Amortized		Unrealized		Unrealized		Available-
		Cost		Gains		Losses		For-Sale
As of December 31, 2021
Assets
Corporate debt securities	$	32,739	$	3	$	(22)	$	32,720
	$	32,739	$	3	$	(22)	$	32,720

The maturities of the investment securities available-for-sale as of March 31, 2022 and December 31, 2021 are shown below (in thousands):

				Gross		Gross
As of March 31, 2022		Amortized		Unrealized		Unrealized		Estimated
Maturity date		Cost		Gains		Losses		Fair Value
Less than one year	$	47,775	$	1	$	(125)	$	47,651
	$	47,775					$	47,651

				Gross		Gross
As of December 31, 2021		Amortized		Unrealized		Unrealized		Estimated
Maturity date		Cost		Gains		Losses		Fair Value
Less than one year	$	32,739	$	3	$	(22)	$	32,720
	$	32,739					$	32,720

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 March 31, 2022 and December 31, 2021 (in thousands):

		Less than Twelve Months				Twelve Months or Greater				Total
As of March 31, 2022				Gross				Gross				Gross
		Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
		Value		Losses		Value		Losses		Value		Losses
Corporate debt securities	$	30,380	$	(117)	$	-	$	-	$	30,380	$	(117)
U.S. Treasury securities		7,483		(8)		-		-		7,483		(8)
	$	37,863	$	(125)	$	-	$	-	$	37,863	$	(125)

		Less than Twelve Months				Twelve Months or Greater				Total
As of December 31, 2021				Gross				Gross				Gross
		Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
		Value		Losses		Value		Losses		Value		Losses
Corporate debt securities	$	27,195	$	(22)	$	-	$	-	$	27,195	$	(22)
	$	27,195	$	(22)	$	-	$	-	$	27,195	$	(22)