FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of Cash, Cash Equivalents and Available-for-Sale Securities by Significant Investment Category

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


	September 30, 2021
	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	$	294,209	$	—	$	—	$	294,209	$	294,209	$	—	$	—

Level 2:
Money market instruments	291,735		—		—		291,735		291,735		—		—
Corporate debt securities	560,004		1,230		(198)		561,036		703		177,468		382,865
U.S. government agency securities	210,444		416		(7)		210,853		12,999		161,207		36,647
Commercial paper	129,818		1		(1)		129,818		17,497		112,321		—
Asset-backed securities	55,182		26		(23)		55,185		—		8,272		46,913
Foreign and other	3,114		150		(6)		3,258		—		3,065		193
Subtotal	1,250,297		1,823		(235)		1,251,885		322,934		462,333		466,618
Total	$	1,544,506	$	1,823	$	(235)	$	1,546,094	$	617,143	$	462,333	$	466,618


	December 31, 2020
	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	$	370,325	$	—	$	—	$	370,325	$	370,325	$	—	$	—

Level 2:
Money market instruments	264,833		—		—		264,833		264,833		—		—
Corporate debt securities	413,137		3,261		(8)		416,390		—		220,551		195,839

U.S. government agency securities	265,298		1,555		(1)		266,852		14,000		192,488		60,364
Asset-backed securities	31,659		85		(2)		31,742		—		3,189		28,553
Foreign and other	549		168		—		717		—		—		717
Subtotal	975,476		5,069		(11)		980,534		278,833		416,228		285,473
Total	$	1,345,801	$	5,069	$	(11)	$	1,350,859	$	649,158	$	416,228	$	285,473

(1) The Company’s short-term marketable securities mature in one year or less.

(2) The Company’s long-term marketable securities mature between one and five years.