Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Net product sales	$ 156,471,000	$ 111,389,000	$ 55,640,000
Cost of sales	24,665,000	21,590,000	15,783,000
Expenses:
Research and development	0	0	4,903,000
Selling, general and administrative	98,827,000	86,063,000	58,602,000
Total expenses	98,827,000	86,063,000	63,505,000
Income (loss) from operations	32,979,000	3,736,000	(23,648,000)
Interest expense, net of interest income	(7,013,000)	(19,040,000)	(10,192,000)
Other (expense) income, net	(3,000)	4,000	(14,000)
Income (loss) before taxes	25,963,000	(15,300,000)	(33,854,000)
Income tax expense	(252,000)	(5,000)	(13,000)
Net income (loss)	25,711,000	(15,305,000)	(33,867,000)
Beneficial conversion feature of convertible preferred stock	0	0	(12,500,000)
Net income (loss) attributable to common stockholders	$ 25,711,000	$ (15,305,000)	$ (46,367,000)
Basic:
Weighted average common stock shares outstanding (in shares)	99,830,520	83,213,704	63,165,063
Basic (loss) earnings per share (in usd per share)	$ 0.26	$ (0.18)	$ (0.73)
Diluted:
Diluted weighted average common stock shares outstanding (in shares)	105,062,522	83,213,704	63,165,063
Diluted (loss) earnings per share (in usd per share)	$ 0.24	$ (0.18)	$ (0.73)
Product Sales
Revenues:
Net product sales	$ 154,574,000	$ 107,888,000	$ 51,410,000
Product Royalty Revenues
Revenues:
Net product sales	1,897,000	3,341,000	3,389,000
Contract Revenues
Revenues:
Net product sales	$ 0	$ 160,000	$ 841,000