Short-Term Investments

9 Months Ended

Sep. 30, 2024

Short-Term Investments [Abstract]

Short-Term Investments

5. Short-Term Investments

The following is a summary of our short-term investments (in thousands):

	September 30, 2024
			Gross		Gross
	Amortized		Unrealized		Unrealized		Estimated
	Cost		Gains		Losses		Fair Value
U.S. Treasury bills and government agency obligations	$	23,218	$	22	$	—	$	23,240
U.S. corporate debt securities		8,611		9		—		8,620
Foreign corporate debt securities		8,321		6		—		8,327
Foreign commercial paper		3,967		3		—		3,970
U.S. commercial paper		992		—		—		992
Total	$	45,109	$	40	$	—	$	45,149

	December 31, 2023
			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
	Cost		Gains		Losses			Fair Value
U.S. Treasury bills and government agency obligations	$	31,625	$	11	$	—		$	31,636
U.S. corporate debt securities		11,652		1		—			11,653
Foreign corporate debt securities		5,459		1		—			5,460
U.S. commercial paper		1,991		—		(1	)		1,990
Foreign commercial paper		993		—		—			993
Total	$	51,720	$	13	$	(1	)	$	51,732

The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity. We regularly monitor and evaluate the realizable value of our marketable securities. We did not recognize any impairment losses during the three and nine months ended September 30, 2024, and 2023.

Unrealized gains and losses associated with our investments are reported in accumulated other comprehensive income (loss). Realized gains and losses associated with our investments, if any, are reported in the statements of operations and comprehensive loss. We did not recognize any realized gains or losses during the three and nine months ended September 30, 2024, and 2023.