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MARKETABLE SECURITIES - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Marketable securities	$ 535	$ 2,247
Marketable equity securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	756	824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	224	418
Gross Unrealized Gains	3	1,841
Marketable securities	$ 535	$ 2,247

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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).

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