FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Cash	$ 3,802	$ 6,337
Adjusted Cost	73,136	77,897
Unrealized Gains	164	247
Fair Value	73,300	78,144
Cash and cash equivalents	32,415	16,466
Short-term Marketable Securities	40,885	61,678
U.S. Treasury Securities, maturities less than three months
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	28,613	10,129
Fair Value	28,613	10,129
Cash equivalents	28,613	10,129
U.S. Treasury Securities, maturities greater than three months
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	40,721	61,431
Unrealized Gains	164	247
Fair Value	40,885	61,678
Short-term Marketable Securities	$ 40,885	$ 61,678

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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