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MARKETABLE SECURITIES - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Cost Basis	$ 11,260	$ 26,585
Gross Unrealized losses	(535)	(554)
Gross Unrealized gains	709	1,030
Fair Value	11,434	27,061
Marketable debt securities
Debt Securities, Available-for-sale [Line Items]
Cost Basis	10,198	25,523
Gross Unrealized losses	0	(5)
Gross Unrealized gains	98	83
Fair Value	10,296	25,601
Marketable equity securities
Debt Securities, Available-for-sale [Line Items]
Cost Basis	1,062	1,062
Gross Unrealized losses	(535)	(549)
Gross Unrealized gains	611	947
Fair Value	$ 1,138	$ 1,460

X

- 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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