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Current Vulnerability Due to Certain Concentrations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Concentration Risks [Abstract] |  |
Duration of business operations in Israel (in years) | P47Y |
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Bank of China [Member] |  |
Concentration Risks [Abstract] |  |
Concentration risk percentage (in hundredths) | 13.90% |
Credit Concentration Risk [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Deutsche Bank [Member] |  |
Concentration Risks [Abstract] |  |
Concentration risk percentage (in hundredths) | 13.10% |
Geographic Concentration [Member] | Outside Of United States [Member] |  |
Concentration Risks [Abstract] |  |
Cash and cash equivalents and short-term investments | $ 1,282,120 |
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | United States [Member] |  |
Concentration Risks [Abstract] |  |
Concentration risk percentage (in hundredths) | 8.10% |
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Germany [Member] |  |
Concentration Risks [Abstract] |  |
Concentration risk percentage (in hundredths) | 43.60% |
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) | 21.60% |
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) | 6.90% |
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other Asia [Member] |  |
Concentration Risks [Abstract] |  |
Concentration risk percentage (in hundredths) | 1.70% |
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Other [Member] |  |
Concentration Risks [Abstract] |  |
Concentration risk percentage (in hundredths) | 0.80% |
Geographic Concentration [Member] | Cash and Cash Equivalents and Short-term Investments [Member] | Singapore [Member] |  |
Concentration Risks [Abstract] |  |
Concentration risk percentage (in hundredths) | 8.10% |
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) | 7.60% |
Geographic Concentration [Member] | Revenue [Member] | Outside Of United States [Member] |  |
Concentration Risks [Abstract] |  |
Concentration risk percentage (in hundredths) | 77.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |
Concentration Risks [Abstract] |  |
Concentration risk percentage (in hundredths) | 16.10% | 15.40%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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