Current Vulnerability Due to Certain Concentrations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Concentration Risks [Abstract]
Duration of business operations in Israel (in years)	P45Y
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Bank Hapoalim
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	12.50%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Bank Leumi [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	12.50%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Unicredit [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	10.70%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | HSBC [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	11.40%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Bank of Tokyo Mitsubishi [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	11.50%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Deutsche Bank [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	11.20%
Geographic Concentration [Member] | Outside Of United States [Member]
Concentration Risks [Abstract]
Cash and cash equivalents and short-term investments	$ 1,080,858
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | United States [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	1.70%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Germany [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	43.50%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other Europe [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	1.60%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Israel [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	29.60%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | People's Republic Of China [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	8.50%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other Asia [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	2.50%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	0.70%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Singapore [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	5.40%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | The Republic of China (Taiwan) [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	6.50%
Geographic Concentration [Member] | Revenue [Member] | Outside Of United States [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	74.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	14.60%	14.70%