FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Cash	$ 5,774
Adjusted Cost	96,096
Unrealized Gains	47
Fair Value	96,143
Short-term Marketable Securities	55,480	$ 0
Cash and cash equivalents	40,663	$ 9,949
U.S. Treasury Securities, maturities less than three months
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	34,889
Fair Value	34,889
Cash equivalents	34,889
U.S. Treasury Securities, maturities greater than three months
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	55,433
Unrealized Gains	47
Fair Value	55,480
Short-term Marketable Securities	$ 55,480

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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