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Marketable Securities (Details 2) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Cash equivalents and marketable securities, Continuous unrealized loss position |  |
Less than one year, Fair Value | $ 42,665 | $ 72,772
Unrealized gain (loss), Gross |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (4) | (21)
US Treasury and Government Short-term Debt Securities [Member] |  |
Cash equivalents and marketable securities, Continuous unrealized loss position |  |
Less than one year, Fair Value | 8,997 | 18,395
Unrealized gain (loss), Gross |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Corporate Debt Securities [Member] |  |
Cash equivalents and marketable securities, Continuous unrealized loss position |  |
Less than one year, Fair Value | 33,668 | 54,377
Unrealized gain (loss), Gross |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (4) | $ (21)

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