As of March 31, 2024 and December 31, 2023, the Company had $320.1 million and $350.7 million, respectively of cash, cash equivalents, restricted cash and investments summarized below. As of March 31, 2024 and December 31, 2023, $255.7 million and $301.8 million were available-for-sale debt securities which are carried at fair market value.


	March 31, 2024
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Cash, cash equivalents and restricted cash	$	64,459	$	—	$	—	$	64,459

Corporate bonds	23,547		—		(3)		23,544
Commercial paper	38,273		—		(30)		38,243
Treasury bills	134,984		—		(9)		134,975
Treasury bonds	58,697		—		(7)		58,690

Total cash, cash equivalents, restricted cash and short-term investments	319,960		—		(49)		319,911
Total long-term investment corporate bond	199		1		—		200
Total cash, cash equivalents, restricted cash and investments	$	320,159	$	1	$	(49)	$	320,111

	December 31, 2023
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Cash, cash equivalents and restricted cash	$	48,875	$	—	$	—	$	48,875

Corporate bonds	33,576		4		—		33,580
Commercial paper	39,305		—		(1)		39,304
Treasury bills	122,757		49		—		122,806
Treasury bonds	105,903		21		—		105,924

Total cash, cash equivalents, restricted cash and short-term investments	350,416		74		(1)		350,489
Total long-term investment corporate bond	200		1		—		201
Total cash, cash equivalents, restricted cash and investments	$	350,616	$	75	$	(1)	$	350,690

As of March 31, 2024 and December 31, 2023, accrued interest receivable from investments was $1.0 million and $0.7 million, respectively. During the three months ended March 31, 2024 and 2023, the Company had $(124) thousand and $73 thousand of unrealized losses and gains on available-for-sale securities, net of tax, respectively, which are included as a component of comprehensive loss on the consolidated statements of operations. Currently, the Company does not intend to sell investments that are in an unrealized loss position, and it is unlikely the Company will be required to sell the investments before recovery of their amortized cost basis, which may be at maturity. The Company has determined that the gross unrealized losses on investments at March 31, 2024, were temporary in nature. Realized gains or losses were immaterial during the three months ended March 31, 2024 and 2023.