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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2014
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 September 30, 2014
 
 
 
Fair Value Hierarchy
 
Total
 
Level 1
 
Level 2
 
Level 3
 
(in thousands)
Financial assets carried at fair value:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
343,129

 
$
343,129

 
$
—

 
$
—

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities
467,868

 
467,868

 
—

 
—

Commercial paper
46,496

 
—

 
46,496

 
—

Corporate debt securities
244,810

 
—

 
244,810

 
—

Total
$
1,102,303

 
$
810,997

 
$
291,306

 
$
—