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INVESTMENTS IN DEBT SECURITIES - Short-Term and Long-Term Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 764,808 |
Fair Value | 761,312 |
Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 577,048 | $ 859,198
Gross Unrealized Gains | 103 | 306
Gross Unrealized Losses | (3,761) | (7,603)
Fair Value | 573,390 | 851,901
Long-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 187,760 | 249,608
Gross Unrealized Gains | 454 | 1,739
Gross Unrealized Losses | (292) | (220)
Fair Value | 187,922 | 251,127
U.S. agency securities | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 58,399 | 68,778
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (676) | (1,263)
Fair Value | 57,723 | 67,515
Corporate bonds | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 135,097 | 216,864
Gross Unrealized Gains | 60 | 96
Gross Unrealized Losses | (626) | (1,733)
Fair Value | 134,531 | 215,227
Corporate bonds | Long-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 96,206 | 94,564
Gross Unrealized Gains | 273 | 809
Gross Unrealized Losses | (95) | (45)
Fair Value | 96,384 | 95,328
Commercial paper | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 724 | 15,159
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 724 | 15,159
Municipal securities | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,391 | 9,396
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (138) | (231)
Fair Value | 9,253 | 9,165
Municipal securities | Long-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,481 | 2,495
Gross Unrealized Gains | 30 | 55
Gross Unrealized Losses | (119) | (138)
Fair Value | 2,392 | 2,412
Certificates of deposit | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 500 | 3,856
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 500 | 3,856
U.S. government securities | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 372,337 | 544,145
Gross Unrealized Gains | 43 | 210
Gross Unrealized Losses | (2,317) | (4,357)
Fair Value | 370,063 | 539,998
U.S. government securities | Long-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 89,073 | 152,549
Gross Unrealized Gains | 151 | 875
Gross Unrealized Losses | (78) | (37)
Fair Value | 89,146 | 153,387
Foreign government securities | Short-term debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 600 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4) | (19)
Fair Value | $ 596 | $ 981

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- 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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