Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Data (unaudited) [Abstract]
Revenues	$ 7,149	$ 8,260	$ 21,675	$ 8,765	$ 16,419	$ 12,418	$ 11,129	$ 12,643	$ 45,849	$ 52,609
Manufacture and supply	2,788	2,978	3,539	3,659	6,792	4,643	5,420	3,506	12,964	20,361
Total costs and expenses	22,795	22,041	21,280	22,626	26,323	23,420	29,817	25,717	88,742	105,277
Net loss	$ (20,368)	$ (16,551)	$ (2,334)	$ (16,530)	$ (12,636)	$ (18,412)	$ (20,472)	$ (14,726)	$ (55,783)	$ (66,246)
Basic and diluted net loss per common share (in dollars per share)	$ (0.60)	$ (0.49)	$ (0.07)	$ (0.49)	$ (0.48)	$ (0.74)	$ (0.82)	$ (0.59)	$ (1.66)	$ (2.61)