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Short-term Investments (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 22,930
Unrealized Gains	31
Unrealized Losses	62
Fair Value	22,899
Held-to-maturity investments with contractual maturities less than one year.	22,930
U.S. government securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	22,930
Unrealized Gains	31
Unrealized Losses	62
Fair Value	$ 22,899

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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