MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2019

Marketable Securities [Abstract]

Schedule of Marketable Securities With Contractual Maturities

Debt securities with contractual maturities of less than one year are as follows:

	December 31,
	2019								2018
	Adjusted		Gross unrealized		Gross unrealized		Market		Adjusted		Gross unrealized			Gross unrealized		Market
	cost		losses		gains		value		cost		losses			gains		value
Foreign banks and government debentures	$	18,193	$	-	$	96	$	18,289	$	6,759	$	(11	)	$	-	$	6,748
Corporate debentures		15,921		-		144		16,065		9,021		(27	)		-		8,994
Total marketable securities	$	34,114	$	-	$	240	$	34,354	$	15,780	$	(38	)	$	-	$	15,742

Debt securities with contractual maturities from one to three years are as follows:

	December 31,
	2019									2018
	Adjusted		Gross unrealized			Gross unrealized		Market		Adjusted		Gross unrealized			Gross unrealized		Market
	cost		losses			gains		value		cost		losses			gains		value
Foreign banks and government debentures	$	56,201	$	-		$	721	$	56,922	$	43,266	$	(358	)	$	6	$	42,914
Corporate debentures		52,419		(19	)		467		52,867		19,881		(338	)		5		19,548
Total marketable securities	$	108,620	$	(19	)	$	1,188	$	109,789	$	63,147	$	(696	)	$	11	$	62,462

Debt securities with contractual maturities of more than three years are as follows:

	December 31,
	2019								2018
	Adjusted		Gross unrealized		Gross unrealized		Market		Adjusted		Gross unrealized			Gross unrealized		Market
	cost		losses		gains		value		cost		losses			gains		value
Foreign banks and government debentures	$	1,062	$	-	$	19	$	1,081	$	11,926	$	(357	)	$	-	$	11,569
Corporate debentures		1,767		-		59		1,826		10,998		(360	)		-		10,638
Total marketable securities	$	2,829	$	-	$	78	$	2,907	$	22,924	$	(717	)	$	-	$	22,207

Summary of Investments With Continuous Unrealized Losses and Related Fair Values

Debt securities with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values as of December 31, 2019 and 2018 were as follows:

	December 31, 2019
	Investments with continuous unrealized losses for less than 12 months					Investments with continuous unrealized losses for 12 months or greater					Total investments with continuous unrealized losses
	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
Corporate debentures	$	3,852	$	(13	)	$	2,631	$	(6	)	$	6,483	$	(19	)
Total marketable securities	$	3,852	$	(13	)	$	2,631	$	(6	)	$	6,483	$	(19	)

	December 31, 2018
	Investments with continuous unrealized losses for less than 12 months					Investments with continuous unrealized losses for 12 months or greater					Total investments with continuous unrealized losses
	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
Foreign banks and government debentures	$	26,860	$	(177	)	$	24,966	$	(550	)	$	51,826	$	(727	)
Corporate debentures		11,947		(122	)		23,605		(604	)		35,552		(726	)
Total marketable securities	$	38,807	$	(299	)	$	48,571	$	(1,154	)	$	87,378	$	(1,453	)