CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED BALANCE SHEETS
Current portion of deferred financing costs for the liability related to the sale of future royalties	$ 772	$ 850
Interest rate (as a percent)	4.50%
Non-current deferred financing costs	$ 50	3,035
Noncurrent portion of deferred financing costs for the liability related to the sale of future royalties	$ 2,373	$ 3,144
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	200,000	200,000
Common stock, issued shares	132,526	87,301
Common stock, outstanding shares	132,526	87,301