CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Preferred stock, authorized shares	20,000,000	20,000,000
Preferred stock, outstanding shares	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized shares	350,000,000	350,000,000
Common stock, Issued shares	113,694,606	96,609,764
Common stock, outstanding shares	113,694,606	96,609,764
Senior Convertible Notes.
Deferred financing costs, net	$ 7,769	$ 12,336