Fair Value Measurements (Tables)

9 Months Ended

Sep. 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 September 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	$	340,573		$	340,573	$	—		$	—
Corporate debt securities	25,109			—		25,109			—
Commercial paper	24,000			—		24,000			—
Marketable securities:
Corporate debt securities	109,335			—		109,335			—
Commercial paper	140,245			—		140,245			—
Prepaid and other current assets:
Foreign currency forward contracts	3,508			—		3,508			—
Other assets:
Foreign currency forward contracts	651			—		651			—
Total financial assets	$	643,421		$	340,573	$	302,848		$	—
Financial liabilities carried at fair value:
Other liabilities, current portion:
Foreign currency forward contracts	$	(1,552	)	$	—	$	(1,552	)	$	—
Other liabilities, excluding current portion:
Foreign currency forward contracts	(24		)	—		(24		)	—
Total financial liabilities	$	(1,576	)	$	—	$	(1,576	)	$	—