The amortized costs, unrealized gains and losses and estimated fair values of our short-term investments were as follows (in thousands):


	October 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government securities	$	52,723	$	—	$	(698)	$	52,025
Corporate bonds	51,918		—		(459)		51,459
Commercial paper	100,908		—		—		100,908
Supranational bonds	9,998		—		(31)		9,967
Foreign government securities	4,033		—		(51)		3,982
Total short-term investments	$	219,580	$	—	$	(1,239)	$	218,341


	January 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government securities	$	18,082	$	—	$	(155)	$	17,927
Corporate bonds	21,225		—		(49)		21,176
Commercial paper	55,234		—		—		55,234
Supranational bonds	3,503		—		—		3,503
Foreign government securities	4,064		—		(22)		4,042
Total short-term investments	$	102,108	$	—	$	(226)	$	101,882