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Marketable Securities (Details 1) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale:
Amortized cost	$ 10,905	$ 12,987
Unrealized losses	(152)	(58)
Unrealized gains
Market value	10,753	12,929
Corporate bonds [Member]
Available-for-sale:
Amortized cost	10,905	12,987
Unrealized losses	(152)	(58)
Unrealized gains
Market value	$ 10,753	$ 12,929

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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