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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 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 subject to fair value measurements:
 
Fair Value Measurements as
of December 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
$
255,689

 
$
255,689

 
$
—

 
$
—

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities
600,450

 
600,450

 
—

 
—

Commercial paper
83,493

 
—

 
83,493

 
—

Corporate debt securities
211,834

 
—

 
211,834

 
—

Total
$
1,151,466

 
$
856,139

 
$
295,327

 
$
—