Acquisitions, Investments, and Licenses - Schedule of Consolidated Assets and Non-Recourse Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 348,192	[1]	$ 96,907	[1]	$ 156,396	$ 185,798
Accounts receivable, net	19,064	[1]	19,969	[1]
Inventory, net	18,324	[1]	16,604	[1]
Prepaid expenses and other current assets	8,445	[1]	9,389	[1]
Total current assets	394,025	[1]	142,869	[1]
Property, plant and equipment, net	15,120	[1]	16,411	[1]
Intangible assets, net	59,432	[1]	62,649	[1]
Goodwill	223,219	[1]	224,292	[1]
Other assets	5,073	[1]	5,838	[1]
Total assets	1,512,249	[1]	1,267,664	[1]
Current liabilities:
Accounts payable	10,472	[1]	8,744	[1]
Accrued expenses	158,763	[1]	60,912	[1]
Total current liabilities	182,838	[1]	83,111	[1]
Other long-term liabilities	410,165	[1]	217,358	[1]
Total liabilities	699,676	[1]	431,923	[1]
SciVac | Variable Interest Entity, Primary Beneficiary
Current assets:
Cash and cash equivalents	303		393
Accounts receivable, net	140		316
Inventory, net	1,534		1,649
Prepaid expenses and other current assets	752		718
Total current assets	2,729		3,076
Property, plant and equipment, net	1,700		1,725
Intangible assets, net	826		875
Goodwill	1,517		1,553
Other assets	346		384
Total assets	7,118		7,613
Current liabilities:
Accounts payable	441		445
Accrued expenses	4,461		4,446
Notes payable	5,349		5,189
Total current liabilities	10,251		10,080
Other long-term liabilities	1,881		2,042
Total liabilities	$ 12,132		$ 12,122

[1] As of March 31, 2015 and December 31, 2014, total assets include $7.1 million and $7.6 million, respectively, and total liabilities include $12.1 million and $12.1 million, respectively, related to SciVac Ltd (“SciVac”), previously known as SciGen (I.L.) Ltd, a consolidated variable interest entity. SciVac’s consolidated assets are owned by SciVac and SciVac’s consolidated liabilities have no recourse against us. Refer to Note 5.