Financial Instruments (Details Textual)	6 Months Ended
	Jun. 30, 2016
Financial Instruments (Textual) [Abstract]
Short-term investments contractual maturity period minimum	4 months
Maximum remaining maturities period of investments included in cash equivalents	3 months
Short-term investments contractual maturity period maximum	10 months
Average short-term investments maturity period	2 months