FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 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 as of December 31, 2021 and 2020, respectively:


	December 31, 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	$	301,177	$	—	$	—	$	301,177	$	301,177	$	—	$	—

Level 2:
Money market instruments	285,099		—		—		285,099		285,099		—		—
Corporate debt securities	584,000		386		(2,086)		582,300		—		200,304		381,996
U.S. government agency securities	224,774		182		(325)		224,631		—		146,421		78,210
Commercial paper	68,384		—		—		68,384		1,000		67,384		—
Asset-backed securities	56,936		10		(95)		56,851		—		9,451		47,400
Foreign and other	3,097		141		(12)		3,226		—		3,039		187
Subtotal	1,222,290		719		(2,518)		1,220,491		286,099		426,599		507,793
Total	$	1,523,467	$	719	$	(2,518)	$	1,521,668	$	587,276	$	426,599	$	507,793


	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.