CONDENSED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Preferred stock, no par value (in dollars per share)
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, no par value (in dollars per share)
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	56,925,105	56,383,713
Common stock, shares outstanding	56,925,105	56,383,713
Series A convertible preferred stock
Preferred stock, shares authorized	25,000	25,000
Preferred stock, shares issued	18,158	18,158
Preferred stock shares surrendered	18,158	18,158
Preferred stock, shares outstanding	0	0