Marketable Securities (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities, Realized Gain (Loss)	$ 0	$ 0
Amortized Cost	24,509,000	46,390,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	7,000	6,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(3,000)	(10,000)
Fair Value	24,513,000us-gaap_AvailableForSaleSecurities	46,386,000us-gaap_AvailableForSaleSecurities
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,685,000	46,390,000
Fair Value	17,689,000	46,386,000
Money market mutual funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,824,000	19,957,000
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	6,824,000	19,957,000
Government agency bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,505,000	7,515,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(3,000)	(6,000)
Fair Value	3,502,000	7,509,000
United States treasuries
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,002,000	8,035,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	4,000	6,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Fair Value	4,006,000	8,041,000
Corporate notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,665,000	8,457,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,000	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	(4,000)
Fair Value	4,667,000	8,453,000
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,155,000	2,426,000
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	4,155,000	2,426,000
Municipal Bonds
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

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.

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

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