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Cash and Cash Equivalents and Investments
 9 Months Ended
Sep. 30, 2012
Cash and Cash Equivalents and Investments [Abstract]  
Cash and Cash Equivalents Disclosure
Cash and Cash Equivalents and Investments
 
The fair value of cash and cash equivalents and investments held at September 30, 2012 and December 31, 2011 are as follows: 
 
 
As of September 30, 2012
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
 
(in thousands)
Cash and cash equivalents
 
$
20,759

 
$
—

 
$
—

 
$
20,759

Securities maturing within one year:
 
 
 
 
 
 
 
 
Certificates of deposit
 
548

 
—

 
—

 
548

U.S. treasury securities
 
185,520

 
23

 
(2
)
 
185,541

Total short-term investments
 
$
186,068

 
$
23

 
$
(2
)
 
$
186,089

Total cash and cash equivalents and investments
 
$
206,827

 
$
23

 
$
(2
)
 
$
206,848

 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2011
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
 
 
 
(in thousands)
 
 
Cash and cash equivalents
 
$
186,309

 
$
—

 
$
—

 
$
186,309

Securities maturing within one year:
 
 
 
 
 
 
 
 
Certificates of deposit
 
548

 
—

 
—

 
548

U.S. treasury securities
 
94,814

 
24

 
(3
)
 
94,835

Total short-term investments
 
$
95,362

 
$
24

 
$
(3
)
 
$
95,383

Total cash and cash equivalents and investments
 
$
281,671

 
$
24

 
$
(3
)
 
$
281,692



There were no realized gains or losses for the nine months ended September 30, 2012, and no realized gains or losses for the nine months ended September 30, 2011. The cost of securities sold is based on the specific identification method.