Investment in Marketable Securities and Fair Value of Financial Instruments (Details) - US Treasury Securities [Member] - USD ($)		6 Months Ended	12 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Line Items]
United States Treasury Notes , Cost		$ 9,969	$ 9,969
United States Treasury Notes, Fair Value		10,005	9,998
United States Treasury Notes, Unrealized Gain	[1]	$ 36	$ 29

[1] Included in other comprehensive income.