MARKETABLE SECURITIES (Tables)

9 Months Ended

Sep. 30, 2018

Cash and Cash Equivalents [Abstract]

Summary of Available-for-Sale Marketable Securities

The following is a summary of available-for-sale marketable securities:


	September 30, 2018 (Unaudited)
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Available-for-sale - matures within one year:
Corporate bonds	$	8,538	$	—	$	(49	)	$	8,489

		8,538		—		(49	)		8,489
Available-for-sale - matures after one year through five years:
Certificate of deposits		747		—		—			747
Government bonds		501		—		(11	)		490
Corporate bonds		70,508		1		(1,452	)		69,057

		71,756		1		(1,463	)		70,294
Total	$	80,294	$	1	$	(1,512	)	$	78,783


	December 31, 2017 (Audited)
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Available-for-sale - matures within one year:
Corporate bonds	$	11,803	$	3	$	(12	)	$	11,794

		11,803		3		(12	)		11,794
Available-for-sale - matures after one year through five years:
Certificate of deposits		747		—		—			747
Government bonds		501		—		(6	)		495
Corporate bonds		70,291		14		(677	)		69,628

		71,539		14		(683	)		70,870
Total	$	83,342	$	17	$	(695	)	$	82,664

Summary of Gross Unrealized Losses and Fair Values on Investments

The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of September 30, 2018 and December 31, 2017, and the length of time that those investments have been in a continuous loss position:


	Less than 12 months					12 months or greater
	Fair value		Gross unrealized loss			Fair value		Gross unrealized loss
As of September 30, 2018 (unaudited)	$	40,918	$	(615	)	$	36,817	$	(897	)
As of December 31, 2017	$	49,921	$	(411	)	$	22,960	$	(284	)

Summary of Gross Realized Gains and Losses from Sale of Available-for-Sale Marketable Securities

The following table presents gross realized gains and losses from sale of available-for-sale marketable securities:


	Nine months ended September 30,						Three months ended September 30,
	2018 (unaudited)			2017 (unaudited)			2018 (unaudited)			2017 (unaudited)
Gross realized gains from sale of available-for-sale marketable securities	$	4		$	14		$	—		$	8
Gross realized losses from sale of available-for-sale marketable securities	$	(34	)	$	(47	)	$	(32	)	$	(1	)