Financial Instruments (Details Textual)	3 Months Ended
	Mar. 31, 2016
Financial Instruments (Textual) [Abstract]
Short-term investments contractual maturity period minimum	5 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	3 months