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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Summary of the valuation of cash equivalents and marketable securities by pricing levels
The following table presents the financial instruments that are carried at fair value and summarizes the valuation of its cash equivalents and marketable securities by the above pricing levels as of December 31, 2014 and 2013:
 
As of December 31, 2014
 
Total
 
Quoted Market Prices in Active Markets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
 
(In thousands)
Money market funds
$
124,938

 
$
124,938

 
$
—

 
$
—

Corporate notes, bonds and commercial paper
145,983

 
—

 
145,983

 
—

Total available-for-sale securities
$
270,921

 
$
124,938

 
$
145,983

 
$
—

 
As of December 31, 2013
 
Total
 
Quoted Market Prices in Active Markets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
 
(In thousands)
Money market funds
$
300,605

 
$
300,605

 
$
—

 
$
—

Corporate notes, bonds and commercial paper
58,492

 
—

 
58,492

 
—

Total available-for-sale securities
$
359,097

 
$
300,605

 
$
58,492

 
$
—
Financial instruments that are measured and carried at cost on a nonrecurring basis
The following table presents the financial instruments that are measured and carried at cost on a nonrecurring basis as of December 31, 2014 and 2013:
 
As of December 31, 2014
 

(in thousands)
Carrying Value
 
Quoted
market
prices in
active
markets
(Level 1)
 
Significant
other
observable
inputs
(Level 2)
 
Significant
unobservable
inputs
(Level 3)
 
Impairment charges for the year ended December 31, 2014
Investment in non-marketable security
$
—

 
$
—

 
$
—

 
$
—

 
$
600

 
As of December 31, 2013
 

(in thousands)
Carrying
Value
 
Quoted
market
prices in
active
markets
(Level 1)
 
Significant
other
observable
inputs
(Level 2)
 
Significant
unobservable
inputs
(Level 3)
 
Impairment charges for the year ended December 31, 2013
Investment in non-marketable security
$
600

 
$
—

 
$
—

 
$
600

 
$
1,400
Financial instruments not carried at fair value but requiring fair value disclosure
The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure as of December 31, 2014 and 2013:
 
As of December 31, 2014
 
As of December 31, 2013

(in thousands)
Face
Value
 
Carrying Value
 
Fair
Value
 
Face
Value
 
Carrying Value
 
Fair
Value
5% Convertible Senior Notes due 2014
$
—

 
$
—

 
$
—

 
$
172,500

 
$
164,047

 
$
175,821

1.125% Convertible Senior Notes due 2018
138,000

 
115,089

 
159,293

 
138,000

 
109,629

 
142,427