Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Current assets
Accounts receivable, allowance for doubtful accounts	$ 5,000	$ 5,000
Stockholders' deficiency
Series A preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Series A preferred stock, shares authorized (in shares)	300,000	300,000
Series A preferred stock, shares issued (in shares)	0	0
Series A preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	58,346,466	57,852,041
Common stock, shares outstanding (in shares)	58,346,466	57,852,041