Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Convertible debt, unamortized debt discount	$ 9,357	$ 11,124
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	80,536,377	79,388,069
Common stock, shares outstanding	80,536,377	79,388,069
Convertible debt
Derivative liability	$ 56	$ 83
Convertible debt, unamortized debt discount	$ 9,358	$ 11,124