Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Product revenue, net	$ 2,673,000	$ 3,646,000
Costs and operating expenses:
Cost of sales	110,000	53,000
Research and development	17,570,000	13,842,000
Selling, general and administrative	6,813,000	5,564,000
Total costs and operating expenses	24,493,000	19,459,000
Loss from operations	(21,820,000)	(15,813,000)
Interest expense	(886,000)	(885,000)
Interest income	45,000	51,000
Other income, net	27,000	45,914,000
(Loss) income before provision for income taxes	(22,634,000)	29,267,000
Provision for income taxes	9,000	19,000
Net (loss) income	$ (22,643,000)	$ 29,248,000
Net (loss) income per common share:
Basic	$ (0.64)	$ 0.86
Diluted	$ (0.64)	$ 0.85
Weighted-average common shares outstanding:
Basic	35,253,147	33,886,896
Diluted	35,253,147	34,220,895