Financial Instruments (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financial Instruments (Textual) [Abstract]
Maximum remaining maturities period of investments included in cash equivalents		11 months
Average short-term investments maturity period		3 months
Loss on write down of property, equipment and other	$ 4,409	$ 0	$ 4,409
Building [Member]
Property, Plant and Equipment [Line Items]
Fair value of building asset		$ 0