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INVESTMENT SECURITIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Amortized cost, as adjusted	$ 26,848	$ 27,999
Gross unrealized holding gains	2	0
Gross unrealized holding losses	10	35
Estimated fair value	26,840	27,964
Short-term Investments [Member] | US Government Agencies Debt Securities [Member]
Amortized cost, as adjusted	26,848	27,999
Gross unrealized holding gains	2	0
Gross unrealized holding losses	10	35
Estimated fair value	$ 26,840	$ 27,964

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
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-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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Amount of unrealized holding gain before loss recognized in the income statement for investments in trading securities.

+ References

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- Definition

Amount of unrealized holding loss before gain recognized in the income statement for investments in trading securities.

+ References

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