Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Convertible debt, unamortized debt discount	$ 12,257	$ 4,610
Preferred stock, par value	$ 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	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	78,640,286	68,744,534
Common stock, shares outstanding	78,640,286	68,744,534
Convertible debt
Derivative liability	7,866	5,914
Convertible debt, unamortized debt discount	$ 12,257	$ 4,610