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Cash and Cash Equivalents and Investments
9 Months Ended
Sep. 30, 2011
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, 2011 and December 31, 2010 are as follows: 
 
 
As of September 30, 2011
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
 
(in thousands)
Cash and cash equivalents
 
$
30,521

 
$
—

 
$
—

 
$
30,521

Securities maturing within one year:
 
 
 
 
 
 
 
 
Certificates of deposit
 
548

 
—

 
—

 
548

U.S. treasury securities
 
113,052

 
42

 
(8
)
 
113,086

Total short-term investments
 
$
113,600

 
$
42

 
$
(8
)
 
$
113,634

Total cash and cash equivalents and investments
 
$
144,121

 
$
42

 
$
(8
)
 
$
144,155

 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2010
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
 
 
 
(in thousands)
 
 
Cash and cash equivalents
 
$
47,207

 
$
1

 
$
—

 
$
47,208

Securities maturing within one year:
 
 
 
 
 
 
 
 
Certificates of deposit
 
545

 
—

 
—

 
545

U.S. treasury securities
 
163,354

 
10

 
(6
)
 
163,358

Total short-term investments
 
$
163,899

 
$
10

 
$
(6
)
 
$
163,903

Total cash and cash equivalents and investments
 
$
211,106

 
$
11

 
$
(6
)
 
$
211,111


There were no realized gains or losses for the three and nine months ended September 30, 2011 and 2010. The cost of securities sold is based on the specific identification method.