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FINANCIAL INSTRUMENTS - Current Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Marketable Securities
Amortized Cost		$ 123,246
Gross Unrealized Gains		3
Gross Unrealized Losses		(3)
Fair Value	$ 0	123,246
Treasury discount notes
Schedule of Available-for-sale Marketable Securities
Amortized Cost		112,291
Gross Unrealized Gains		3
Gross Unrealized Losses		(3)
Fair Value		112,291
Commercial paper
Schedule of Available-for-sale Marketable Securities
Amortized Cost		10,955
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		$ 10,955

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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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