CASH EQUIVALENTS AND MARKETABLE SECURITIES - Schedule of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,015,630	$ 969,740
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(10,383)	(2,859)
Fair Value	1,005,248	966,881
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	193,627	69,546
Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	811,621	897,335
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	193,627	35,789
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	193,627	35,789
Money market funds \| Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	193,627	35,789
Money market funds \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,000	16,001
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(2)
Fair Value	5,999	15,999
Certificate of deposit \| Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	6,000
Certificate of deposit \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	5,999	9,999
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	164,243	215,964
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(379)	(114)
Fair Value	163,864	215,850
Commercial paper \| Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	26,997
Commercial paper \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	163,864	188,853
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	164,858	199,244
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(2,860)	(872)
Fair Value	161,999	198,372
Corporate notes and bonds \| Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	760
Corporate notes and bonds \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	161,999	197,612
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		14,999
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Fair Value		14,998
U.S. Treasuries \| Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value		0
U.S. Treasuries \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value		14,998
U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	486,902	487,743
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7,143)	(1,870)
Fair Value	479,759	485,873
U.S. Government agencies \| Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
U.S. Government agencies \| Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 479,759	$ 485,873

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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