The following table summarizes the Company’s cash and available-for-sale securities’ amortized cost, unrealized gains (losses), and fair value by significant investment category reported as cash and cash equivalents, restricted cash short-term, restricted cash, or available-for-sale securities as of March 31, 2024 and December 31, 2023.


(in thousands)									Reported as:
March 31, 2024	Amortized Cost		Unrealized Gain		Unrealized (Loss)		Fair Value		Cash & Cash Equivalents		Available-for-sale securities		Restricted Cash (Current and Non-Current)
Cash	$	94,585	$	—	$	—	$	94,585	$	87,212	$	—	$	7,373
Level I:
Money market funds	157,722		—		—		157,722		157,722		—		—
Level II:
Corporate bonds	340,136		151		(412)		339,875		1,998		337,877		—
U.S. treasury securities	953,305		348		(842)		952,811		7,469		945,342		—
U.S. government agency securities	36,745		—		(69)		36,676		—		36,676		—
Commercial paper	141,905		1		—		141,906		—		141,906		—
Subtotal	1,472,091		500		(1,323)		1,471,268		9,467		1,461,801		—
Total assets measured at fair value on a recurring basis	$	1,724,398	$	500	$	(1,323)	$	1,723,575	$	254,401	$	1,461,801	$	7,373


(in thousands)									Reported as:
December 31, 2023	Amortized Cost		Unrealized Gain		Unrealized (Loss)		Fair Value		Cash & Cash Equivalents		Available-for-sale securities		Restricted Cash (Current and Non-Current) Cash
Cash	$	51,189	$	—	$	—	$	51,189	$	46,829	$	—	$	4,360
Level I:
Money market funds	40,035		—		—		40,035		40,035		—		—
Level II:
Corporate bonds	312,510		718		(378)		312,850		—		312,850		—
U.S. treasury securities	1,020,167		2,344		(544)		1,021,967		—		1,021,967		—
U.S. government agency securities	84,154		14		(96)		84,072		—		84,072		—
Commercial paper	167,989		2		—		167,991		—		167,991		—
Subtotal	1,584,820		3,078		(1,018)		1,586,880		—		1,586,880		—
Total assets measured at fair value on a recurring basis	$	1,676,044	$	3,078	$	(1,018)	$	1,678,104	$	86,864	$	1,586,880	$	4,360