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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments [Abstract]  
Available-for-sale Securities
Available-for-sale investments as of December 31, 2015 were as follows (in thousands):

  
Amortized
Cost
  
Gross
Unrealized
Gains
  
Gross
Unrealized
Losses
  
Fair
Value
 
U.S. Treasury securities
 
$
9,354
  
$
1
  
$
(6
)
 
$
9,349
 
Government-sponsored enterprises
  
22,055
   
1
   
(9
)
  
22,047
 
Corporate debt securities
  
111,473
   
42
   
(34
)
  
111,481
 
Total
 
$
142,882
  
$
44
  
$
(49
)
 
$
142,877