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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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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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