CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CONSOLIDATED BALANCE SHEETS
Current portion of deferred financing costs for the liability related to the sale of future royalties	$ 832	$ 850
Interest rate (as a percent)	4.50%
Non-current deferred financing costs	$ 2,869	3,035
Noncurrent portion of deferred financing costs for the liability related to the sale of future royalties	$ 2,943	$ 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	150,000,000	150,000,000
Common stock, issued shares	89,348,000	87,301,000
Common stock, outstanding shares	89,348,000	87,301,000