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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2015
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 and liabilities subject to fair value measurements:
 
Fair Value Measurements as of March 31, 2015
 
 
 
Fair Value Hierarchy
 
Total
 
Level 1
 
Level 2
 
Level 3
 
(in thousands)
Financial assets carried at fair value:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
286,581

 
$
286,581

 
$
—

 
$
—

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities
284,115

 
284,115

 
—

 
—

Corporate debt securities
172,395

 
—

 
172,395

 
—

Commercial paper
59,745

 
—

 
59,745

 
—

Prepaid and other current assets:
 
 
 
 
 
 
 
Foreign currency forward contracts
2,934

 
—

 
2,934

 
—

Total financial assets
$
805,770

 
$
570,696

 
$
235,074

 
$
—

Financial liabilities carried at fair value:
 
 
 
 
 
 
 
Other liabilities, current portion:
 
 
 
 
 
 
 
Foreign currency forward contracts
$
(282
)
 
$
—

 
$
(282
)
 
$
—

Other liabilities, excluding current portion:
 
 
 
 
 
 
 
Foreign currency forward contracts
(335
)
 
—

 
(335
)
 
—

Total financial liabilities
$
(617
)
 
$
—

 
$
(617
)
 
$
—