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CASH EQUIVALENTS AND INVESTMENTS - Schedule of Activity for Cash Equivalents and Investments (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Amortized cost, gross unrealized gains and losses and fair value of marketable debt and equity securities and investments
Cash equivalents, amortized cost	$ 310
Cash equivalents, fair value	310
Amortized cost	7,299
Unrealized gains	0
Unrealized losses	(15)
Fair value	7,284
U.S. government agency notes
Amortized cost, gross unrealized gains and losses and fair value of marketable debt and equity securities and investments
Amortized cost	3,998
Unrealized gains	0
Unrealized losses	(9)
Fair value	3,989
Corporate debt securities
Amortized cost, gross unrealized gains and losses and fair value of marketable debt and equity securities and investments
Amortized cost	3,301
Unrealized gains	0
Unrealized losses	(6)
Fair value	$ 3,295

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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).

+ References

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Amount, before tax, of unrealized loss 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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Amount of 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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