Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2015
				Fair Value Hierarchy
	Total			Level 1		Level 2			Level 3
	(in thousands)
Financial assets carried at fair value:
Cash equivalents:
Money market funds	$	518,084		$	518,084	$	—		$	—
Marketable securities:
Corporate debt securities	120,408			—		120,408			—
Commercial paper	25,499			—		25,499			—
Prepaid and other current assets:
Foreign currency forward contracts	1,087			—		1,087			—
Total financial assets	$	665,078		$	518,084	$	146,994		$	—
Financial liabilities carried at fair value:
Other liabilities, current portion:
Foreign currency forward contracts	$	(2,737	)	$	—	$	(2,737	)	$	—
Other liabilities, excluding current portion:
Foreign currency forward contracts	(313		)	—		(313		)	—
Total financial liabilities	$	(3,050	)	$	—	$	(3,050	)	$	—