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Marketable Securities (Details 2) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Amortized cost	$ 10,905	$ 12,987
Unrealized gains (losses), Gains
Unrealized gains (losses), Losses	(152)	(58)
Market value	10,753	$ 12,929
Due within one year [Member]
Amortized cost	4,513
Unrealized gains (losses), Gains
Unrealized gains (losses), Losses	(34)
Market value	4,479
Due after one year through three years [Member]
Amortized cost	6,392
Unrealized gains (losses), Gains
Unrealized gains (losses), Losses	(118)
Market value	$ 6,274

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

+ Details

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Balance Type:	credit
Period Type:	instant

X

- 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.

+ References

No definition available.

+ Details

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X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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