CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Par value of common stock (in dollars per share)
Common Stock, shares authorized	150,000	150,000
Common Stock, shares issued	86,443	43,784
Common Stock, shares outstanding	86,443	43,784
Series B-1 non-voting convertible preferred stock
Par value of convertible preferred stock (in dollars per share)
Convertible preferred stock, shares authorized	39	39
Convertible preferred stock, shares reserved	39	39
Convertible preferred stock, shares issued	0	0
Convertible preferred stock, shares outstanding	0	0
Series B-2 voting convertible preferred stock
Par value of convertible preferred stock (in dollars per share)
Convertible preferred stock, shares reserved	39	39
Convertible preferred stock, shares authorized	39	39
Convertible preferred stock, shares issued	12	12
Convertible preferred stock, shares outstanding	0	0