Investment in Marketable Securities and Fair Value of Financial Instruments (Details Textual) - US Treasury Securities [Member] - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Line Items]
Marketable securities as available for sale	$ 10,005	$ 9,998
Marketable securities maturity period	Matures in December 2015	Matures in December 2015