Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Balance Sheets
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	18,919,304	18,726,723
Common stock, shares outstanding	18,919,304	18,726,723