CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED BALANCE SHEETS
Current portion of deferred financing costs	$ 7
Interest rate (as a percent)	4.50%	4.50%
Non-current deferred financing costs	$ 22
Sale of future royalties, current portion and deferred financing costs	319	$ 635
Sale of future royalties, noncurrent portion and deferred financing costs	$ 584	$ 859
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares	5,000	5,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	300,000	200,000
Common stock, issued shares	194,998	150,136
Common stock, outstanding shares	194,998	150,136