Condensed Consolidated Statements of Operations and Comprehensive (Loss)/Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Consolidated Statements of Operations and Comprehensive (Loss)/Income (Unaudited) [Abstract]
Revenues	$ 12,643	$ 23,411
Cost and expenses:
Manufacture and supply	3,506	5,636
Research and development	4,303	4,901
Selling, general and administrative	17,908	7,569
Total costs and expenses	25,717	18,106
(Loss)/income from operations	(13,074)	5,305
Other income/(expenses):
Interest expense	(1,926)	(1,927)
Interest income	274	24
Change in fair value of warrant	0	697
Net (loss)/income before income taxes	(14,726)	4,099
Income taxes	0	0
Net (loss)/income	(14,726)	4,099
Comprehensive (loss)/income	$ (14,726)	$ 4,099
Net (loss)/income per share - basic and diluted (in dollars per share)	$ (0.59)	$ 0.27
Weighted-average number of common shares outstanding - basic and diluted (in shares)	24,963,603	15,077,647