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FINANCIAL INSTRUMENTS - Cash and Financial Assets That are Measured at Fair Value on a Recurring Basis for Each of the Hierarchy Levels (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | $ 61,069 | $ 109,464
Unrealized Gains | 0 | 21
Accrued Interest | 0 | 59
Estimated Fair Value | 61,069 | 109,544
Cash & Cash Equivalents | 61,069 | 104,183
Investment Securities | 0 | 5,361
Cash |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 60,277 | 94,824
Estimated Fair Value | 60,277 | 94,824
Cash & Cash Equivalents | 60,277 | 94,824
Level 1: |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost |  | 10,760
Unrealized Gains |  | 12
Estimated Fair Value |  | 10,772
Cash & Cash Equivalents |  | 9,359
Investment Securities |  | 1,413
Level 1: | Money market accounts |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 792 | 9,359
Estimated Fair Value | 792 | 9,359
Cash & Cash Equivalents | $ 792 | 9,359
Level 1: | Government & agency securities |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost |  | 1,401
Unrealized Gains |  | 12
Estimated Fair Value |  | 1,413
Investment Securities |  | 1,413
Level 2: | Municipal bonds |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost |  | 3,880
Unrealized Gains |  | 9
Accrued Interest |  | 59
Estimated Fair Value |  | 3,948
Investment Securities |  | $ 3,948

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