Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) [Abstract]
Revenues	$ 11,129	$ 13,928	$ 23,772	$ 37,339
Costs and expenses:
Manufacture and supply	5,420	4,973	8,926	10,609
Research and development	8,151	7,994	12,454	12,895
Selling, general and administrative	16,246	33,668	34,154	41,213
Total costs and expenses	29,817	46,635	55,534	64,717
Loss from operations	(18,688)	(32,707)	(31,762)	(27,378)
Other income/(expenses):
Interest expense	(1,937)	(1,927)	(3,863)	(3,876)
Interest income	153	0	427	22
Change in fair value of warrant	0	(1,859)	0	(1,162)
Net loss before income taxes	(20,472)	(36,493)	(35,198)	(32,394)
Income taxes	0	0	0	0
Net loss	(20,472)	(36,493)	(35,198)	(32,394)
Comprehensive loss	$ (20,472)	$ (36,493)	$ (35,198)	$ (32,394)
Net loss per share - basic and diluted (in dollars per share)	$ (0.82)	$ (1.90)	$ (1.41)	$ (1.89)
Weighted-average number of common shares outstanding - basic and diluted (in shares)	24,980,861	19,188,624	24,972,280	17,144,492