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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 351,299 | $ 99,929
Available-for-sale Securities, Gross Unrealized Gains | 3 | 67
Available-for-sale Securities, Gross Unrealized Losses | (108) | 0
Available-for-sale Securities, Fair Value Disclosure | 351,194 | 99,996
Short-term Investments [Member] | Certificates of Deposit [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 240 |
Available-for-sale Securities, Gross Unrealized Gains | 0 |
Available-for-sale Securities, Gross Unrealized Losses | 0 |
Available-for-sale Securities, Fair Value Disclosure | 240 |
Short-term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 226,448 |
Available-for-sale Securities, Gross Unrealized Gains | 3 |
Available-for-sale Securities, Gross Unrealized Losses | (97) |
Available-for-sale Securities, Fair Value Disclosure | 226,354 |
Short-term Investments [Member] | U.S. Government Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 124,611 | 99,929
Available-for-sale Securities, Gross Unrealized Gains | 0 | 67
Available-for-sale Securities, Gross Unrealized Losses | (11) | 0
Available-for-sale Securities, Fair Value Disclosure | 124,600 | $ 99,996
Long-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 159,692 |
Available-for-sale Securities, Gross Unrealized Gains | 10 |
Available-for-sale Securities, Gross Unrealized Losses | (134) |
Available-for-sale Securities, Fair Value Disclosure | 159,568 |
Long-term Investments [Member] | U.S. Government Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 159,692 |
Available-for-sale Securities, Gross Unrealized Gains | 10 |
Available-for-sale Securities, Gross Unrealized Losses | (134) |
Available-for-sale Securities, Fair Value Disclosure | $ 159,568 |

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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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