Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Net product sales	$ 111,389,000	$ 55,640,000	$ 61,985,000
Cost of sales	21,590,000	15,783,000	19,496,000
Expenses:
Research and development	0	4,903,000	13,040,000
Selling, general and administrative	86,063,000	58,602,000	58,869,000
Total expenses	86,063,000	63,505,000	71,909,000
Income (loss) from operations	3,736,000	(23,648,000)	(29,420,000)
Interest expense	(19,040,000)	(10,192,000)	(8,577,000)
Bargain purchase gain	0	0	27,336,000
Other income (expense), net	4,000	(14,000)	(26,000)
Loss before income taxes	(15,300,000)	(33,854,000)	(10,687,000)
Income tax (expense) benefit	(5,000)	(13,000)	15,972,000
Net (loss) income	(15,305,000)	(33,867,000)	5,285,000
Beneficial conversion feature of convertible preferred stock	0	(12,500,000)	0
Net (loss) income attributable to common stockholders	$ (15,305,000)	$ (46,367,000)	$ 5,285,000
Basic:
Weighted average common stock shares outstanding (in shares)	83,213,704	63,165,063	55,355,802
Basic (loss) earnings per share (in usd per share)	$ (0.18)	$ (0.73)	$ 0.10
Diluted:
Diluted weighted average common stock shares outstanding (in shares)	83,213,704	63,165,063	56,402,479
Diluted (loss) earnings per share (in usd per share)	$ (0.18)	$ (0.73)	$ 0.09
Product Sales
Revenues:
Net product sales	$ 107,888,000	$ 51,410,000	$ 34,922,000
Product Royalty Revenues
Revenues:
Net product sales	3,341,000	3,389,000	5,070,000
Research And Development Reimbursements
Revenues:
Net product sales	0	0	799,000
Contract Revenues
Revenues:
Net product sales	$ 160,000	$ 841,000	$ 21,194,000