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INVESTMENT SECURITIES - Summary of investment securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost, as adjusted | $ 54,888 | $ 51,987
Gross unrealized holding gains | 4 | 1
Gross unrealized holding losses | 13 | 4
Estimated fair value | 54,879 | 51,984
Short-term Investments [Member] | Obligations of domestic governmental agencies [Member] |  |
Amortized cost, as adjusted | 30,338 | 51,987
Gross unrealized holding gains | 3 | 1
Gross unrealized holding losses | 1 | 4
Estimated fair value | 30,340 | $ 51,984
Long-term investments [Member] | Obligations of domestic governmental agencies [Member] |  |
Amortized cost, as adjusted | 24,550 |
Gross unrealized holding gains | 1 |
Gross unrealized holding losses | 12 |
Estimated fair value | $ 24,539 |

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