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Fair Value Measurements (Tables)
 3 Months Ended
Sep. 30, 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 September 30, 2013
 
 
 
Fair Value Hierarchy
 
Total
 
Level 1
 
Level 2
 
Level 3
 
(in thousands)
Financial assets carried at fair value:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
308,981

 
$
308,981

 
$
—

 
$
—

Government-sponsored enterprise securities
2,895

 
2,895

 
—

 
—

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities
555,527

 
555,527

 
—

 
—

Commercial paper
125,264

 
—

 
125,264

 
—

Corporate debt securities
158,678

 
—

 
158,678

 
—

Total
$
1,151,345

 
$
867,403

 
$
283,942

 
$
—