Current Vulnerability Due to Certain Concentrations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Concentration Risks [Abstract]
Duration of business operations in Israel (in years)	P46Y
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Bank Leumi [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	10.60%
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)	12.40%
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Deutsche Bank [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	10.60%
Geographic Concentration [Member] | Outside Of United States [Member]
Concentration Risks [Abstract]
Cash and cash equivalents and short-term investments	$ 1,084,453
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | United States [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	9.40%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Germany [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	40.60%
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)	24.00%
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)	5.90%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other Asia [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	2.20%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	0.60%
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Singapore [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	7.70%
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)	8.00%
Geographic Concentration [Member] | Revenue [Member] | Outside Of United States [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	76.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risks [Abstract]
Concentration risk percentage (in hundredths)	15.40%	14.60%