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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Financial assets subject to fair value measurements (excluding restricted cash and cash equivalents (Alios))
The following table sets forth the Company’s financial assets (excluding Alios’ cash equivalents) subject to fair value measurements:
 
Fair Value Measurements as
of March 31, 2013
 
 
 
Fair Value Hierarchy
 
Total
 
Level 1
 
Level 2
 
Level 3
 
(in thousands)
Financial assets carried at fair value:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
201,831

 
$
201,831

 
$
—

 
$
—

Government-sponsored enterprise securities
38,588

 
38,588

 
—

 
—

Marketable securities:
 
 
 
 
 
 
 
U.S. Treasury securities
13,205

 
13,205

 
—

 
—

Government-sponsored enterprise securities
550,478

 
550,478

 
—

 
—

Commercial paper
216,942

 
—

 
216,942

 
—

Corporate debt securities
79,630

 
—

 
79,630

 
—

Restricted cash
31,934

 
31,934

 
—

 
—

Total
$
1,132,608

 
$
836,036

 
$
296,572

 
$
—