The following tables show the Company’s cash, cash equivalents and available-for-sale securities by significant investment category for each period presented:


	June 30, 2024
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Aggregate Fair Value		Cash and Cash Equivalents		Short-term Marketable Securities (1)		Long-term Marketable Securities (2)
Level 1:
Cash	$	285,666	$	—	$	—	$	285,666	$	285,666	$	—	$	—

Level 2:
Money market instruments	676,505		—		—		676,505		676,505		—		—
Corporate debt securities	537,626		670		(1,460)		536,836		—		162,959		373,877
U.S. government agency securities	184,487		39		(966)		183,560		9,979		88,310		85,271

Asset-backed securities	98,958		105		(196)		98,867				932		97,935

Subtotal	1,497,576		814		(2,622)		1,495,768		686,484		252,201		557,083
Total	$	1,783,242	$	814	$	(2,622)	$	1,781,434	$	972,150	$	252,201	$	557,083


	December 31, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Aggregate Fair Value		Cash and Cash Equivalents		Short-term Marketable Securities (1)		Long-term Marketable Securities (2)
Level 1:
Cash	$	229,676	$	—	$	—	$	229,676	$	229,676	$	—	$	—

Level 2:
Money market instruments	499,483		—		—		499,483		499,483		—		—
Corporate debt securities	587,896		3,476		(1,996)		589,376		—		193,251		396,125
U.S. government agency securities	251,952		556		(1,140)		251,368		19,976		111,343		120,049
Commercial paper	20,076		5		—		20,081		5,992		14,089		—
Asset-backed securities	94,744		351		(134)		94,961		—		—		94,961

Subtotal	1,454,151		4,388		(3,270)		1,455,269		525,451		318,683		611,135
Total	$	1,683,827	$	4,388	$	(3,270)	$	1,684,945	$	755,127	$	318,683	$	611,135