Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Total revenues	$ 0	$ 0	$ 0
Operating costs and expenses:
Selling, general and administrative	61,373	62,690	64,759
Research and development	79,325	75,157	51,525
Total operating costs and expenses	140,698	137,847	116,284
Loss from continuing operations before other (expense) income and income taxes	(140,698)	(137,847)	(116,284)
Other (expense) income :
Interest income (expense), net	4,996	(340)	(6,798)
Other (expense) income, net	(8,892)	9,580	389
Total other (expense) income	(3,896)	9,240	(6,409)
Loss from continuing operations before income taxes	(144,594)	(128,607)	(122,693)
Benefit for income taxes from continuing operations	9,208	1,901	21,941
Loss from continuing operations	(135,386)	(126,706)	(100,752)
Income from discontinued operations, net of income taxes (Note 12)	22,697	5,965	8,563
Net loss	$ (112,689)	$ (120,741)	$ (92,189)
Basic and diluted (loss) income per share:
Loss per common share from continuing operations (in dollar per share)	$ (1.22)	$ (1.23)	$ (1.18)
Income per common share from discontinued operations (in dollar per share)	0.21	0.06	0.10
Net loss per common share (in dollars per share)	$ (1.02)	$ (1.17)	$ (1.08)
Weighted average shares outstanding:
Basic (shares)	110,585,768	103,305,911	85,115,592
Diluted (shares)	110,585,768	103,305,911	85,115,592