Available-for-sale marketable securities were as follows (in thousands):


	March 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Commercial paper	$	50,904	$	—	$	—		$	50,904
Corporate debt		14,814		1		(18	)		14,797
U.S. government agency		15,081		—		(20	)		15,061
Asset-backed securities		3,013		—		(6	)		3,007
Total	$	83,812	$	1	$	(44	)	$	83,769


	December 31, 2021 (1)
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Commercial paper	$	43,969	$	—	$	—		$	43,969
Corporate debt		17,084		—		(12	)		17,072
U.S. government agency		5,056		—		(3	)		5,053
Asset-backed securities		7,695		—		(5	)		7,690
Total	$	73,804	$	—	$	(20	)	$	73,784

(1) These items have been reclassified to conform to current period presentation.

All of the Company’s available-for-sale debt marketable securities held as of March 31, 2022 had contractual maturities of less than one year. The Company had 9 securities in an unrealized loss position with an aggregate related fair value of $24.8 million as of March 31, 2022. All securities in an unrealized loss position as of March 31, 2022 had been in a loss position for less than 12 months. Unrealized losses on available-for-sale marketable securities as of March 31, 2022 were not significant and were primarily due to changes in interest rates, including market credit spreads, and not due to increased credit risks associated with specific securities. Accordingly, no allowance for credit losses related to the Company’s available-for-sale marketable securities was recorded for the three months ended March 31, 2022. The Company does not intend to sell these securities or expect to be required to sell the investments before recovery of their amortized cost bases, which may be at maturity. The Company recorded interest income of $0.2 million, offset by amortization of premium of $0.1 million, for the three months ended March 31, 2022, which is included in other income, net on the condensed consolidated statements of operations and comprehensive loss.