As of September 30, 2024, and December 31, 2023, the Company had $348.7 million and $350.7 million, respectively of cash, cash equivalents, restricted cash, and investments summarized below. As of September 30, 2024, and December 31, 2023, $311.6 million and $301.8 million were available-for-sale debt securities which are carried at fair market value.


	September 30, 2024
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Cash, cash equivalents, and restricted cash	$	37,142	$	—	$	—	$	37,142

Corporate bonds	599		2		—		601
Commercial paper	2,028		—		—		2,028
Treasury bills	196,311		160		—		196,471
Treasury bonds	112,246		259		—		112,505

Total cash, cash equivalents, restricted cash, and short-term investments	348,326		421		—		348,747
Total long-term investment corporate bond	—		—		—		—
Total cash, cash equivalents, restricted cash, and investments	$	348,326	$	421	$	—	$	348,747

	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 September 30, 2024, and December 31, 2023, accrued interest receivable from investments was $0.5 million and $0.7 million, respectively. During the three and nine months ended September 30, 2024, the Company had $0.5 million and $0.3 million of unrealized gains on available-for-sale securities, net of tax, respectively, which are included as a component of comprehensive income (loss) on the consolidated statements of operations. During the three and nine months ended September 30, 2023, the Company had $0.1 million and $0.1 million of unrealized gains on available-for-sale securities, net of tax, respectively, which are included as a component of comprehensive income (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 gains on investments at September 30, 2024, were temporary in nature. Realized gains or losses were immaterial during the three and nine months ended September 30, 2024, and 2023.