The amortized costs, unrealized gains and losses and fair values of cash equivalents and marketable securities were as follows (in thousands):


	March 31, 2023
Description	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Cash equivalents:
Money market funds	$	24,674	$	—	$	—		$	24,674
Commercial paper		2,391		—		—			2,391
Corporate debt securities		2,822		—		—			2,822
U.S. government treasuries		3,987		—		—			3,987
Total cash equivalents		33,874		—		—			33,874
Short-term marketable securities:
U.S. government treasuries		22,139		3		(20	)		22,122
Asset backed securities		484		—		—			484
U.S. government debt securities		26,967		19		(6	)		26,980
Certificates of deposit		948		—		—			948
Commercial paper		28,759		6		(5	)		28,760
Corporate debt securities		19,435		—		(49	)		19,386
Total short-term marketable securities		98,732		28		(80	)		98,680
Total	$	132,606	$	28	$	(80	)	$	132,554


	December 31, 2022
Description	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Cash equivalents:
Money market funds	$	38,191	$	—	$	—		$	38,191
Total cash equivalents		38,191		—		—			38,191
Short-term marketable securities:
Certificates of deposit		948		1		—			949
Commercial paper		33,318		23		(13	)		33,328
Corporate debt securities		21,887		6		(40	)		21,853
U.S. government treasuries		35,608		3		(71	)		35,540
U.S. government debt securities		24,703		22		(6	)		24,719
Total short-term marketable securities		116,464		55		(130	)		116,389
Long-term marketable securities:
Corporate debt securities		933		—		(1	)		932
U.S. government treasuries		3,103		—		(4	)		3,099
Total long-term marketable securities		4,036		—		(5	)		4,031
Total	$	158,691	$	55	$	(135	)	$	158,611

All marketable securities held as of March 31, 2023 had contractual maturities of less than one year. There have been no material realized gains or losses on marketable securities for the periods presented. As of March 31, 2023, the Company did not hold any individual securities in an unrealized loss position for 12 months or greater. The Company has the ability and intent to hold all marketable securities that have been in a continuous loss position until maturity or recovery. No significant facts or circumstances have arisen to indicate that there has been any significant deterioration in the creditworthiness of the issuers of the securities held by us. The Company considered the current and expected future economic and market conditions and determined that the estimate of credit losses was not significantly impacted. Thus, there has been no change in estimate of expected credit loss during the three months ended March 31, 2023 and no allowance for credit loss was recorded at March 31, 2023 and December 31, 2022. The Company will continue to assess the current and expected future economic and market conditions as further development arises.

See Note 4 for further information regarding the fair value of the Company’s financial instruments.