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Investments (Tables)
 9 Months Ended
Sep. 30, 2016
Investments [Abstract]  
Contract Maturity of Available-for-Sale Securities
The following table summarizes the contract maturity of the available-for-sale securities we held as of September 30, 2016:

One year or less
54%
After one year but within two years
28%
After two years but within three and a half years
18%
Total
100%
Summary of Investments
The following is a summary of our investments (in thousands):

   
Gross Unrealized
     
September 30, 2016
 
Cost (1)
  
Gains
  
Losses
  
Other-Than-
Temporary
Impairment Loss
  
Estimated Fair Value
 
Available-for-sale securities:
               
Corporate debt securities
 
$
195,953
  
$
36
  
$
(152
)
 
$
—
  
$
195,837
 
Debt securities issued by U.S. government agencies
  
29,512
   
11
   
—
   
—
   
29,523
 
Debt securities issued by the U.S. Treasury (2)
  
28,011
   
14
   
—
   
—
   
28,025
 
Debt securities issued by states of the U.S. and political subdivisions of the states (2)
  
79,805
   
2
   
(119
)
  
—
   
79,688
 
Total securities with a maturity of one year or less
  
333,281
   
63
   
(271
)
  
—
   
333,073
 
Corporate debt securities
  
217,980
   
457
   
(713
)
  
—
   
217,724
 
Debt securities issued by U.S. government agencies
  
33,859
   
1
   
(33
)
  
—
   
33,827
 
Debt securities issued by states of the U.S. and political subdivisions of the states
  
36,169
   
24
   
(100
)
  
—
   
36,093
 
Total securities with a maturity of more than one year
  
288,008
   
482
   
(846
)
  
—
   
287,644
 
Total available-for-sale securities
 
$
621,289
  
$
545
  
$
(1,117
)
 
$
—
  
$
620,717
 
Equity securities:
                    
Regulus Therapeutics Inc.
 
$
7,162
  
$
2,745
  
$
—
  
$
(525
)
 
$
9,382
 
Total equity securities
 
$
7,162
  
$
2,745
  
$
—
  
$
(525
)
 
$
9,382
 
Total available-for-sale and equity securities
 
$
628,451
  
$
3,290
  
$
(1,117
)
 
$
(525
)
 
$
630,099
 



   
Gross Unrealized
   
December 31, 2015
 
Cost (1)
  
Gains
  
Losses
  
Estimated Fair Value
 
Available-for-sale securities:
            
Corporate debt securities
 
$
181,670
  
$
5
  
$
(250
)
 
$
181,425
 
Debt securities issued by U.S. government agencies
  
50,559
   
1
   
(19
)
  
50,541
 
Debt securities issued by the U.S. Treasury
  
2,604
   
—
   
(3
)
  
2,601
 
Debt securities issued by states of the U.S. and political subdivisions of the states (2)
  
79,414
   
18
   
(88
)
  
79,344
 
Total securities with a maturity of one year or less
  
314,247
   
24
   
(360
)
  
313,911
 
Corporate debt securities
  
258,703
   
3
   
(1,705
)
  
257,001
 
Debt securities issued by U.S. government agencies
  
38,956
   
—
   
(244
)
  
38,712
 
Debt securities issued by states of the U.S. and political subdivisions of the states
  
48,552
   
3
   
(243
)
  
48,312
 
Total securities with a maturity of more than one year
  
346,211
   
6
   
(2,192
)
  
344,025
 
Total available-for-sale securities
 
$
660,458
  
$
30
  
$
(2,552
)
 
$
657,936
 
Equity securities:
                
Regulus Therapeutics Inc.
 
$
7,162
  
$
17,630
  
$
—
  
$
24,792
 
Total equity securities
 
$
7,162
  
$
17,630
  
$
—
  
$
24,792
 
Total available-for-sale and equity securities
 
$
667,620
  
$
17,660
  
$
(2,552
)
 
$
682,728
 

(1)
Our available-for-sale securities are held at amortized cost.

(2)
Includes investments classified as cash equivalents on our condensed consolidated balance sheet.
Temporarily Impaired Investments
Investments we consider to be temporarily impaired at September 30, 2016 were as follows (in thousands):

     
Less than 12 months of
temporary impairment
  
More than 12 months of
temporary impairment
  
Total temporary
impairment
 
  
Number of
Investments
  
Estimated
Fair Value
  
Unrealized
Losses
  
Estimated
Fair Value
  
Unrealized
Losses
  
Estimated
Fair Value
  
Unrealized
Losses
 
Corporate debt securities
  
162
  
$
203,357
  
$
(470
)
 
$
33,639
  
$
(395
)
 
$
236,996
  
$
(865
)
Debt securities issued by U.S. government agencies
  
19
   
31,517
   
(33
)
  
—
   
—
   
31,517
   
(33
)
Debt securities issued by states of the U.S. and political subdivisions of the states
  
117
   
63,551
   
(140
)
  
16,979
   
(79
)
  
80,530
   
(219
)
Total temporarily impaired securities
  
298
  
$
298,425
  
$
(643
)
 
$
50,618
  
$
(474
)
 
$
349,043
  
$
(1,117
)