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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

X
- Definition 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). + References 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 + Details
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