Available for Sale Securities (Schedule of Available-for-sale Securities Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 16,889	$ 17,708
Gross unrealized gains	227	213
Gross unrealized losses	(52)	(158)
Fair value	17,064	17,763
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	10,352	11,965
Gross unrealized gains	140	140
Gross unrealized losses	(37)	(116)
Fair value	10,455	11,989
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	6,375	5,567
Gross unrealized gains	84	71
Gross unrealized losses	(15)	(42)
Fair value	6,444	5,596
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	100	100
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	100	100
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	62	76
Gross unrealized gains	3	2
Gross unrealized losses	0	0
Fair value	$ 65	$ 78