Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	$ 25,320	$ 25,490
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	170	90
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(39)	(54)
Available-for-sale Securities, Fair Value Disclosure	25,451	25,526
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	19,242	18,832
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	126	68
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(39)	(43)
Available-for-sale Securities, Fair Value Disclosure	19,329	18,857
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities, Amortized cost	6,078	6,658
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	44	22
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	(11)
Available-for-sale Securities, Fair Value Disclosure	$ 6,122	$ 6,669