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Marketable Securities (Details 2) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Cash equivalents and marketable securities, Continuous unrealized loss position |  |
Less than one year, Fair Value | $ 66,245 | $ 159,673
Unrealized gain (loss), Gross |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (47) | (188)
US Treasury and Government Short-term Debt Securities [Member] |  |
Cash equivalents and marketable securities, Continuous unrealized loss position |  |
Less than one year, Fair Value | 0 | 14,110
Unrealized gain (loss), Gross |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (32)
Corporate Debt Securities [Member] |  |
Cash equivalents and marketable securities, Continuous unrealized loss position |  |
Less than one year, Fair Value | 66,245 | 145,563
Unrealized gain (loss), Gross |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (47) | $ (156)

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