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Investments
 6 Months Ended
Jun. 30, 2016
Investments [Abstract]  
Investments
3. Investments

Available-for-sale investments as of June 30, 2016 and December 31, 2015 were as follows (in thousands):



  
June 30, 2016
 
  
Amortized
Cost
  
Gross
Unrealized
Gains
  
Gross
Unrealized
Losses
  
Fair
Value
 
U.S. Treasury securities
 
$
5,262
  
$
1
  
$
-
  
$
5,263
 
Government-sponsored enterprises
  
29,109
   
12
   
-
   
29,121
 
Corporate debt securities
  
168,927
   
81
   
(35
)
  
168,973
 
Total
 
$
203,298
  
$
94
  
$
(35
)
 
$
203,357
 



  
December 31, 2015
 
  
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
 

All of the Company's available-for-sale investments held at June 30, 2016 and December 31, 2015 had maturity dates of less than one year, and all available-for-sale investments in an unrealized loss position as of June 30, 2016 and December 31, 2015 were in a loss position for less than twelve months.  There were no unrealized losses at June 30, 2016 or December 31, 2015 that the Company determined to be other-than-temporary.