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Short-term Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, amortized cost | $ 19,403 |  |
Available-for-sale securities, gross unrealized gains | 40 |  |
Available-for-sale securities, gross unrealized losses | 0 |  |
Available-for-sale securities, fair value | $ 19,443 |  |
Investment Maturity Date | Dec. 31, 2017 |  |
Available-for-sale Securities, Gross Realized Losses | $ 1 | $ 617 | $ 2,188
Proceeds from Sale and Maturity of Marketable Securities | $ 43,232 | $ 82,115 | $ 182,115

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