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Short-term Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Held-to-maturity Securities
The following table summarizes the held-to-maturity securities held at December 31, 2016:
 
 
 
 
 
 
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
As of December 31, 2016
 
 
 
 
 
 
 
 
U.S. government securities
 
$
22,930

 
31

 
62

 
$
22,899

Total short-term investments
 
$
22,930

 
31

 
62

 
$
22,899