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Investments (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2016:

One year or less
51%
After one year but within two years
32%
After two years but within three and a half years
17%
Total
100%
Summary of Investments
The following is a summary of our investments (in thousands):

   
Gross Unrealized
   
March 31, 2016
 
Cost
  
Gains
  
Losses
  
Estimated
Fair Value
 
Available-for-sale securities (1):
            
Corporate debt securities
 
$
161,995
  
$
29
  
$
(59
)
 
$
161,965
 
Debt securities issued by U.S. government agencies
  
42,545
   
3
   
(1
)
  
42,547
 
Debt securities issued by the U.S. Treasury
  
13,101
   
3
   
(3
)
  
13,101
 
Debt securities issued by states of the United States and political subdivisions of the states (2)
  
78,231
   
14
   
(97
)
  
78,148
 
Total securities with a maturity of one year or less
  
295,872
   
49
   
(160
)
  
295,761
 
Corporate debt securities
  
242,995
   
608
   
(416
)
  
243,187
 
Debt securities issued by U.S. government agencies
  
36,951
   
2
   
(12
)
  
36,941
 
Debt securities issued by states of the United States and political subdivisions of the states
  
40,201
   
26
   
(82
)
  
40,145
 
Total securities with a maturity of more than one year
  
320,147
   
636
   
(510
)
  
320,273
 
Total available-for-sale securities
 
$
616,019
  
$
685
  
$
(670
)
 
$
616,034
 
Equity securities:
                
Regulus Therapeutics Inc.
 
$
7,162
  
$
12,541
  
$
—
  
$
19,703
 
Total equity securities
 
$
7,162
  
$
12,541
  
$
—
  
$
19,703
 
Total available-for-sale and equity securities
 
$
623,181
  
$
13,226
  
$
(670
)
 
$
635,737
 


   
Gross Unrealized
   
December 31, 2015
 
Cost
  
Gains
  
Losses
  
Estimated
Fair Value
 
Available-for-sale securities (1):
            
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 United States 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 United States 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 March 31, 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
  
168
  
$
203,743
  
$
(442
)
 
$
16,040
  
$
(33
)
 
$
219,783
  
$
(475
)
Debt securities issued by U.S. government agencies
  
8
   
28,890
   
(13
)
  
1,000
   
—
   
29,890
   
(13
)
Debt securities issued by the U.S. Treasury
  
1
   
10,523
   
(3
)
  
—
   
—
   
10,523
   
(3
)
Debt securities issued by states of the United States and political subdivisions of the states
  
204
   
65,721
   
(92
)
  
18,936
   
(87
)
  
84,657
   
(179
)
Total temporarily impaired securities
  
381
  
$
308,877
  
$
(550
)
 
$
35,976
  
$
(120
)
 
$
344,853
  
$
(670
)