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Marketable Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities, Interest Income	$ 0	$ 110
Amortized Cost	22,618,000	24,509,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,000	7,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	(3,000)
Fair Value	22,619,000	24,513,000
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,374,000	17,685,000
Fair Value	9,375,000	17,689,000
Money market mutual funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,244,000	6,824,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Fair Value	13,244,000	6,824,000
Government agency bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3,505,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(3,000)
Fair Value		3,502,000
United States treasuries
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,002,000	4,002,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	4,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Fair Value	1,002,000	4,006,000
Corporate notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,283,000	4,665,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,000	2,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Fair Value	2,284,000	4,667,000
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,089,000	4,155,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Fair Value	$ 6,089,000	4,155,000
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,358,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		1,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0
Fair Value		$ 1,359,000

X

- Definition

This item represents the cost of debt 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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