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Investments (Tables)
 6 Months Ended
Jun. 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 June 30, 2016:

One year or less
55%
After one year but within two years
32%
After two years but within three and a half years
13%
Total
100%
Summary of Investments
The following is a summary of our investments (in thousands):

   
Gross Unrealized
   
June 30, 2016
 
Cost (1)
  
Gains
  
Losses
  
Estimated Fair Value
 
Available-for-sale securities:
            
Corporate debt securities
 
$
179,005
  
$
52
  
$
(82
)
 
$
178,975
 
Debt securities issued by U.S. government agencies
  
44,765
   
15
   
—
   
44,780
 
Debt securities issued by the U.S. Treasury
  
13,063
   
11
   
—
   
13,074
 
Debt securities issued by states of the U.S. and political subdivisions of the states (2)
  
88,043
   
12
   
(92
)
  
87,963
 
Total securities with a maturity of one year or less
  
324,876
   
90
   
(174
)
  
324,792
 
Corporate debt securities
  
191,442
   
945
   
(165
)
  
192,222
 
Debt securities issued by U.S. government agencies
  
31,950
   
5
   
(1
)
  
31,954
 
Debt securities issued by the U.S. Treasury
  
8,983
   
14
   
—
   
8,997
 
Debt securities issued by states of the U.S. and political subdivisions of the states
  
29,682
   
78
   
(26
)
  
29,734
 
Total securities with a maturity of more than one year
  
262,057
   
1,042
   
(192
)
  
262,907
 
Total available-for-sale securities
 
$
586,933
  
$
1,132
  
$
(366
)
 
$
587,699
 
Equity securities:
                
Regulus Therapeutics Inc.
 
$
7,162
  
$
1,888
  
$
(833
)
 
$
8,217
 
Total equity securities
 
$
7,162
  
$
1,888
  
$
(833
)
 
$
8,217
 
Total available-for-sale and equity securities
 
$
594,095
  
$
3,020
  
$
(1,199
)
 
$
595,916
 


   
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 June 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
  
103
  
$
96,050
  
$
(65
)
 
$
43,526
  
$
(182
)
 
$
139,576
  
$
(247
)
Debt securities issued by U.S. government agencies
  
2
   
4,999
   
(1
)
  
—
   
—
   
4,999
   
(1
)
Debt securities issued by states of the U.S. and political subdivisions of the states
  
89
   
42,285
   
(42
)
  
18,897
   
(76
)
  
61,182
   
(118
)
Regulus Therapeutics Inc.
  
1
   
2,168
   
(833
)
  
—
   
—
   
2,168
   
(833
)
Total temporarily impaired securities
  
195
  
$
145,502
  
$
(941
)
 
$
62,423
  
$
(258
)
 
$
207,925
  
$
(1,199
)