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MARKETABLE SECURITIES - Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Interest receivable | $ 2,500 | $ 2,300
Amortized Cost | 243,595 | 247,384
Gross Unrealized Gains | 322 | 967
Gross Unrealized Losses | (754) | (711)
Estimated Fair Market Value | 243,163 | 247,640
Investments due in 3 months or less: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 18,891 | 10,688
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | (63) | (42)
Estimated Fair Market Value | 18,830 | 10,646
Investments due in 4-12 months: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 34,732 | 49,398
Gross Unrealized Gains | 6 | 15
Gross Unrealized Losses | (206) | (347)
Estimated Fair Market Value | 34,532 | 49,066
Investments due in 12 months or greater: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 189,972 | 187,298
Gross Unrealized Gains | 314 | 952
Gross Unrealized Losses | (485) | (322)
Estimated Fair Market Value | 189,801 | 187,928
Commercial paper | Investments due in 4-12 months: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 728 | 718
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 728 | 718
Corporate securities | Investments due in 3 months or less: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 18,891 | 10,688
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | (63) | (42)
Estimated Fair Market Value | 18,830 | 10,646
Corporate securities | Investments due in 4-12 months: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 34,004 | 48,680
Gross Unrealized Gains | 6 | 15
Gross Unrealized Losses | (206) | (347)
Estimated Fair Market Value | 33,804 | 48,348
Corporate securities | Investments due in 12 months or greater: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 189,972 | 187,298
Gross Unrealized Gains | 314 | 952
Gross Unrealized Losses | (485) | (322)
Estimated Fair Market Value | $ 189,801 | $ 187,928

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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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