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MARKETABLE SECURITIES Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Interest receivable | $ 1,400 | $ 1,500
Amortized Cost | 266,715 | 373,400
Gross Unrealized Gains | 0 | 21
Gross Unrealized Losses | (6,506) | (1,186)
Estimated Fair Market Value | 260,209 | 372,235
Investments due in 3 months or less: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,316 | 97,250
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (14) | (3)
Estimated Fair Market Value | 6,302 | 97,247
Investments due in 4-12 months: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 113,048 | 25,054
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,253) | (42)
Estimated Fair Market Value | 110,795 | 25,012
Investments due in 12 months or greater: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 147,351 | 251,096
Gross Unrealized Gains | 0 | 21
Gross Unrealized Losses | (4,239) | (1,141)
Estimated Fair Market Value | 143,112 | 249,976
Commercial paper | Investments due in 3 months or less: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 89,965
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Market Value |  | 89,965
Corporate securities | Investments due in 3 months or less: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,316 | 7,285
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (14) | (3)
Estimated Fair Market Value | 6,302 | 7,282
Corporate securities | Investments due in 4-12 months: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 113,048 | 25,054
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,253) | (42)
Estimated Fair Market Value | 110,795 | 25,012
Corporate securities | Investments due in 12 months or greater: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 147,351 | 251,096
Gross Unrealized Gains | 0 | 21
Gross Unrealized Losses | (4,239) | (1,141)
Estimated Fair Market Value | $ 143,112 | $ 249,976

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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://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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- Definition 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). + 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 (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amortized cost 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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