FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Cash	$ 1,300	$ 6,337
Adjusted Cost		77,897
Unrealized Gains		247
Fair Value		78,144
Cash and cash equivalents	62,272	16,466
Short-term Marketable Securities	$ 0	61,678
U.S. Treasury Securities, maturities less than three months
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost		10,129
Fair Value		10,129
Cash equivalents		10,129
U.S. Treasury Securities, maturities greater than three months
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost		61,431
Unrealized Gains		247
Fair Value		61,678
Short-term Marketable Securities		$ 61,678

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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Amortized cost of 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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