Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Treasury stock, shares	60,040	8,215
Common Stock
Common stock, par value (in dollars per share)	0.0001	0.0001
Common stock, shares authorized	240,000,000	240,000,000
Common stock, shares issued	70,861,822	61,954,576
Common stock, shares outstanding	70,801,782	61,946,361
Non-Voting Common Stock
Common stock, par value (in dollars per share)	0.0001	0.0001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	1,669,205	10,576,180
Common stock, shares outstanding	1,669,205	10,576,180