Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Total revenues	$ 55,640	$ 61,985	$ 15,546
Cost of sales	15,783	19,496	11,258
Expenses:
Research and development	4,903	13,040	18,878
Selling, general and administrative	58,602	58,869	49,345
Total expenses	63,505	71,909	68,223
Loss from operations	(23,648)	(29,420)	(63,935)
Interest expense	(10,192)	(8,577)	(3,267)
Bargain purchase gain		27,336
Other (expense) income, net	(14)	(26)	64
Loss before income taxes	(33,854)	(10,687)	(67,138)
Income tax benefit	(13)	15,972
Net (loss) income	(33,867)	5,285	(67,138)
Beneficial conversion feature of convertible preferred stock	(12,500)
Net (loss) income attributable to common stockholders	$ (46,367)	$ 5,285	$ (67,138)
Basic:
Weighted average common stock shares outstanding	63,165,063	55,355,802	53,679,134
Basic (loss) earnings per share	$ (0.73)	$ 0.10	$ (1.25)
Diluted:
Diluted weighted average common stock shares outstanding	63,165,063	56,402,479	53,679,134
Diluted (loss) earnings per share	$ (0.73)	$ 0.09	$ (1.25)
Product Sales [Member]
Revenues:
Total revenues	$ 51,410	$ 34,922	$ 8,266
Product Royalty Revenues [Member]
Revenues:
Total revenues	3,389	5,070	3,646
Research And Development Reimbursements [Member]
Revenues:
Total revenues		799	1,134
Contract Revenues [Member]
Revenues:
Total revenues	$ 841	$ 21,194	$ 2,500