MARKETABLE SECURITIES (Tables)

6 Months Ended

Jun. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

The following table sets forth the Company’s marketable securities for the indicated periods:

	December 31,		June 30,
	2018		2019
Level 2 securities:
U.S government and agency bonds	$	7,933	$	3,996
Canada government bonds		1,009		1,007
Other foreign government bonds		5,259		2,977
Corporate bonds*		42,461		27,539
Total	$	56,662	$	35,519

* Investments in Corporate bonds rated A or higher.

Summary of Changes in Fair Value of Marketable Securities

The table below sets forth a summary of the changes in the fair value of the Company’s marketable securities for the indicated periods:

	Marketable securities
	For the year ended			For the Six Months ended
	December 31, 2018			June 30, 2019
Balance at beginning of the period	$	-		$	56,662
Additions		71,783			2,551
Sale or maturity		(15,092	)		(23,773	)
Changes in fair value during the period		(29	)		79
Balance at end of the period	$	56,662		$	35,519

Schedule of Debt Securities

As of June 30, 2019, the Company’s debt securities had the following maturity dates:

	Market value
	June 30,
	2019
Due within one year		34,014
Between 1-2 years		1,505