Discontinued Operations - Key Financial Results (Details) - Infectious Disease Business - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net product revenues	$ (26)	$ 6,751
Cost of product revenue	214	3,575
Research and development	412	11,983
Selling, general and administrative	3,096	22,725
Total operating expenses	3,722	38,283
Income (loss) from operations	(3,748)	(31,532)
Gain from sale of business	168,955	0
Other expense, net	(74)	(120)
Income (loss) from discontinued operations before income taxes	165,133	(31,652)
Benefit for income taxes	51,148	22
Income (loss) from discontinued operations, net of tax	$ 113,985	$ (31,674)