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FINANCIAL INSTRUMENTS (Tables) | 3 Months Ended
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Mar. 31, 2022
Investments, All Other Investments [Abstract] |
Schedule of Cash and Financial Assets That are Measured at Fair Value on a Recurring Basis for Each of the Hierarchy Levels | The following tables present the Company’s cash and financial assets that are measured at fair value on a recurring basis for each of the hierarchy levels (in thousands):
| March 31, 2022
| Cost |  | Unrealized Gains |  | Accrued Interest |  | Estimated Fair Value |  | Cash & Cash Equivalents |  | Investment Securities
Cash | $ | 107,342 |  |  | $ | — |  |  | $ | — |  |  | $ | 107,342 |  |  | $ | 107,342 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |
Money market accounts | 10,661 |  |  | — |  |  | — |  |  | 10,661 |  |  | 10,661 |  |  | — |
Government & agency securities | 1,401 |  |  | 5 |  |  | 8 |  |  | 1,414 |  |  | — |  |  | 1,414 |
| 12,062 |  |  | 5 |  |  | 8 |  |  | 12,075 |  |  | 10,661 |  |  | 1,414 |
Level 2: |  |  |  |  |  |  |  |  |  |  |
Municipal bonds | 2,625 |  |  | 2 |  |  | 16 |  |  | 2,643 |  |  | — |  |  | 2,643 |
Total | $ | 122,029 |  |  | $ | 7 |  |  | $ | 24 |  |  | $ | 122,060 |  |  | $ | 118,003 |  |  | $ | 4,057 |
| December 31, 2021
| Cost |  | Unrealized Gains |  | Accrued Interest |  | Estimated Fair Value |  | Cash & Cash Equivalents |  | Investment Securities
Cash | $ | 94,824 |  |  | $ | — |  |  | $ | — |  |  | $ | 94,824 |  |  | $ | 94,824 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |
Money market accounts | 9,359 |  |  | — |  |  | — |  |  | 9,359 |  |  | 9,359 |  |  | — |
Government & agency securities | 1,401 |  |  | 12 |  |  | — |  |  | 1,413 |  |  | — |  |  | 1,413 |
| 10,760 |  |  | 12 |  |  | — |  |  | 10,772 |  |  | 9,359 |  |  | 1,413 |
Level 2: |  |  |  |  |  |  |  |  |  |  |
Municipal bonds | 3,880 |  |  | 9 |  |  | 59 |  |  | 3,948 |  |  | — |  |  | 3,948 |
Total | $ | 109,464 |  |  | $ | 21 |  |  | $ | 59 |  |  | $ | 109,544 |  |  | $ | 104,183 |  |  | $ | 5,361 |

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