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Current Vulnerability Due to Certain Concentrations (Details) - USD ($) $ in Thousands | 12 Months Ended
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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%

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