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MARKETABLE SECURITIES - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 824	$ 824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	399	418
Gross Unrealized Gains	982	1,841
Marketable securities	1,407	2,247
Marketable equity securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	824	824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	399	418
Gross Unrealized Gains	982	1,841
Marketable securities	$ 1,407	$ 2,247

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- Definition

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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